Editing Doom community jargon

As with any other long-running community, the [[Doom]] community has a long list of '''technical jargon''', memes, slang terms, idioms, and catchphrases. Without knowledge of these terms, many Doom community discussions may be indecipherable for new members or new mappers. An example sentence would be as follows: 

{{quote|The borders in your map have wiggle problems, but you can only see them if you're bottlenecking the stairs. Maybe replace them with slopes or widen that area out? Also, remove the number of hitscanners in those hallways because it's almost impossible on UV MAX unless I spam plasma from the map before. This would be impossible on pistol start.|Hypothetical advisor|nosource=true}}

This list is by no means exhaustive, but should help a newbie in understanding the gist of old and new Doom community discussion.

== # ==

* '''[[Congestion 1024|1024]]''' - A mapping style inspired by [[Exquisite Corpse]] with a simple constraint: The player must never leave a 1024x1024 space in the map. Due to the limitations, advanced mapping tricks are employed to make full use of the level space. 1024 maps were popular in the mid 2000s, and are still being created today. Other variants of 1024 include 2048, 512, and, in [[joke WAD]] style, 64.

* '''[[1 Monster]]''' - A mapping style that only allows one monster type per map.

* '''[[10 Sectors]]''' - Originally a Doomworld competition held in 2000, this mapping style only allows 10 sectors. Most 10 sector maps require Boom compatible source ports due to the use of Boom's sector effects. A variant of this style, [[2 Sectors]], was not as popular as 10 sectors, although many maps in that style were created for [[ZDoom]], which allows the player to walk on top of [[things]]. A recent variant in the same vein of 10 Sectors is [[100 Lines]].

== A ==

* '''AA''' - Short for [[Ancient Aliens]], a popular [[PWAD]] created by [[Paul DeBruyne (skillsaw)]].

* '''[[ACS]]''' - A scripting language and corresponding {{wp|bytecode}} format that originated in [[Raven Software]]'s [[Hexen]]. Often implied to refer to what is actually [[ACS#Extended_ACS|Extended ACS]], an evolution of the ACS language and bytecode format supported by [[ZDoom]] and the [[Eternity Engine]].

* '''[[Agitating skeleton]]''' - A nickname for the [[revenant]]. Originally from a satirical "How-To" YouTube video by [[Matt Cibulas (RottKing)]], it was popularized by the 4chan {{c|/vr/}} group.

* '''Alignment''' - More specifically "texture alignment," adjustments made to the vertical and horizontal positioning of textures in Doom levels to provide an aesthetically pleasing appearance.
[[File:CIF3DialogueBug.png|thumb|right|''"You will pay for attacking the ZDoom"'']]
* '''Attacking the ZDoom''' - The act of designing a mod to push the limits of [[ZDoom]] to the point of hilarious errors, or to exploit a bug in a ZDoom feature in order to obtain a desired effect. Originally from a [[Community is Falling 3]] screenshot displaying a bug in the dialogue system, in which the screenshot read, "You will pay for attacking the ZDoom".

* '''AP''' - Abbreviation for [[Armors|armor]] points, adapted from RPG terminology. Use is most frequent in the Russian community, whereas the English parlance is typically just "armor".

* '''Autoload''' - Also known as "autoloading". A feature present in certain [[source ports]] but predominantly used in a [[GUI launcher]]. Autoloading allows a set of preferred [[WAD]], [[PK3]] and [[DeHackEd]] files to be loaded every time the game is run. This is thus essential when loading several gameplay and graphical mods, either for the base games or when run alongside a [[PWAD]].

* '''AV''' - Short for [[Alien Vendetta]], a popular [[PWAD]] for speed running. Could also refer in brief to the [[arch-vile]].

== B ==

* '''BA''' - Abbreviation for [[blue armor]]; use is most common in the multiplayer community.

* '''Ball shit snakes''' - Ancient [[Doomworld forums]] meme from a disgruntled member with a questionable grasp of English.

* '''BFG whore''' - Competitive Doom trash-talk for a player who consistently abuses the [[BFG9000]], especially in areas where avoiding the tracer cone is impossible.

* '''Blur-o-vision''' - Term coined by [[Christoph Oelckers (Graf Zahl)]] to describe negative effects of the limited visibility of details at a distance in Doom's original 320x200 video mode. Adopted sarcastically by the [[Chocolate Doom]] [[IRC]] channel, which previously referred to itself as the "Home of blur-o-vision." See also chop-o-vision.

* '''BoH''' - Short for [[baron of Hell]].

* '''[[Boom]]''' - An {{wp|MS-DOS}} [[source port]], one of the first to be created, notable for its extended mapping features. Boom lives on in two of the modern source ports: [[PrBoom+]] and the [[Eternity Engine]]. Can also refer to ''Boom compatible''.

* '''Boom compatible''' - A map designed to use [[Boom]] mapping features or depending on its extended [[Static limit|limits]]. Boom compatible maps usually run in every popular [[source port]], with few exceptions.

* '''Borders''' - Small [[sector]]s with a slightly raised floor that outline a main floor along a wall, analogous to moulding in a house. Borders were a mapping fad in the mid-2000s.

* '''Botting''' - Use of an {{wp|aimbot}}. Due to the simplicity of Doom mechanics, it is easy to spot an active aimbot. Since Doom uses [[autoaim]], use of an aimbot is seen as a form of griefing.

* '''Bottlenecking''' - The act of leading monsters into a small area or opening to make them easier to take out. Some in the scene have viewed this tactic as "cheap" and have designed their maps to discourage bottlenecking or eliminate it entirely.

* '''Brightmap''' - Usually a term for a bitmap containing information for brightened areas of a texture to be lit in-game regardless of lighting conditions, brightmaps retain this definition in hardware source ports. In software-rendered source ports, brightmaps may refer to a specially constructed [[COLORMAP]] which has entries that retain full brightness regardless of a sector's light level. [[Strife]] is a notable example, where it is applied to robots, computer panels, and texture- and sprite-based lights.

* '''[[Brutal Doom]]''' - Gameplay mod for [[ZDoom]]. While highly notable and having a large following, many of its gameplay changes are controversial and divisive within the community. A few believed that Brutal Doom was the {{wp|Eternal September}} of the Doom Community, and left the scene. Derived phrases from this mod include: "Not Brutal enough", "Does this run with Brutal Doom?", and "Brootal."

* '''BSP''' - {{wp|Binary space partitioning}}, a method of searching a {{wp|binary tree}} pre-calculated from the geometry of a map in order to determine the drawing order of walls. Since BSPs are binary trees, the effort required to classify a point in space is reduced to {{wp|logarithmic time}}. The use of a BSP tree allows Doom to render large, complex areas with relative ease and little overdraw. May also refer to the first community-created, eponymous [[node builder]], [[BSP (node builder)|BSP]].

* '''Bump''' - Another term for a [[grab]].

== C ==

* '''Caco''' - Short for [[cacodemon]].

* '''Cardboard''' - An optimized software renderer by [[Stephen McGranahan (SoM)]]. Used in the [[Eternity Engine]].

* '''CG''' - Abbreviation for [[chaingun]].

* '''Chop-o-vision''' - A term analogous to blur-o-vision for referring to the 35 Hz refresh rate of the vanilla Doom engine, and the display quality of source ports still limited to it rather than having support for [[uncapped framerate]]. Usage originated on and is mostly limited to Doomworld.

* '''[[Circle strafing|Circle strafe]]''' - Moving in a circle around a target.

* '''[[COLORMAP]]''' - A [[lump]] in a [[WAD]] file that most software renderers use to determine light levels.

* '''[[Compet-n]]''' - Derived from "competition;" refers to the "Compet-n database", a website hosting Doom speed runs which were recorded under the site's strict rules.

* '''Complevel''' - Short for "compatibility level", a feature in [[PrBoom]] that allows demos recorded from various versions of Boom and Doom to be played back without desyncs. Further shortened to '''cl''' in some contexts, such as "run this demo with cl2".

* '''[[Community project]]''' - An open WAD project that welcomes mappers from the community to participate.

* '''Copypasta''' - A term for the action of a mapper directly copy-pasting sections of a map solely for the sake of breaking up perceived monotony. An example would be a large number of "sector lights" in a hallway that would otherwise be barren. Prudent texture use can help remedy this problem.

* '''Corona''' - A bright ring displayed around light sources in some Doom mods and source ports, usually accomplished with an [[translucency|alpha-blended]] [[sprite]]. This term originated in hardware-accelerated source ports like [[Doom Legacy]]. [[Doomsday]] uses the term "halo" for this effect. Though not technically correct, "lens flare" may be used interchangeably.

* '''Cybie''' - A [[cyberdemon]].

== D ==

* '''D2ALL''' - A demo completing all the levels in a mapset without dying (excepting [[Suicide_exit#Forced_suicide_exit|death exits]]). Secret levels are mandatory in [[Speedrun#General_demo_categories|categories]] requiring 100% kills and/or secrets, and optional otherwise.

* '''Deathmatcher''' - A Doom community member who is most known for playing the [[Deathmatch]] game mode. This terminology was extremely common in the early days, but still sees occasional use. Variants of the phrase include "DMer" and "'matcher".

* '''[[Decal]]''' - A graphic drawn on a wall in some source ports to show blood splatter or wall damage, such as bullet holes and plasma scorches. [[Doom Legacy]] was the first to add this effect, known as "splats." Doom was supposed to ship with a wall damage system, described as "violent bread crumbs" in the initial press release by id Software, but it was never implemented.

* '''[[DECORATE]]''' - [[Content definition language]] used to create [[actor]]s and [[weapon]]s in the [[ZDoom]] [[source port]]. It became an instant hit with Doom modders and was a major reason for ZDoom's dominance. It is supported by multiple ports, though it has since been superseded in [[GZDoom]] by the [[ZScript]] language.

* '''DeePsea patches''' - [[Picture_format#Tall_patches|Tall patches]], an extension to Doom's primary column-based image format.

* '''[[DeHackEd]]''' - A program designed to allow modifying various aspects of the [[DOOM.EXE|executable file]] for Doom, and the distributable patch files created by it (DEH). Most source ports have support for loading DeHackEd patches, making binary modification no longer necessary outside of DOS.

* '''[[DEHSUPP]]''' - A lump for ZDoom that defines DeHackEd capabilities; modifying the DEHSUPP lump allows to alter the effects of a DEHACKED patch, including giving access to states and codepointers from other supported games such as Heretic. It has since been deprecated in favour of [[DECORATE]], but is still used and extended in [[ZDaemon]]. DEHSUPP was the subject of controversy among some who protested its removal with no suitable replacement ready to fill the gap.

* '''Delted''' - Slang for "deleted." Comes from a [https://www.doomworld.com/ralphis/ joke page] touting a site-wide hacking of [[Doomworld]] by community member [[Ralph Vickers (Ralphis)]].

* '''[[Demo]]''' - A record of player inputs during a game. Since the game does not feature true randomness, player inputs are all that is needed to reproduce exactly how the game played, as long as every non-player-driven step of the game remains unchanged. Demos can only be played on the same version of the engine that recorded it, or a perfect emulation of this version, otherwise they will desync.

* '''Desync''' - Short for 'desynchronize', usually used to describe a situation in which demo playback fails due to inconsistencies in the game state. Desyncs may also affect multiplayer games during play, causing the current game to end abruptly.

* '''DevBuild/DevBuilds''' - Also known as ''build/builds'' and short for ''development build''. Refers to the automatically built code packages as made by [[DRD Team]] and the [[Doomsday]] ''Autobuilder''. As these packages are made without supervision, they are usually described as ''unstable'', may contain errors, and are not representative of a stable release version. 

* '''Dime''' - A Doom speed runner who famously rocket-suicided while streaming. To "pull a Dime" or to be "Dimed" means to rocket suicide by wall or enemy.

* '''DM''' - Abbreviation for [[deathmatch]], original id Software terminology for player-vs-player combat. John Romero is widely credited with coining the term.

* '''DoomCute''' - An adjective applied to real-life objects recreated in the Doom engine, usually in highly simplified form. A term invented by [[kmxexii]]. 

* '''Door with health''' - A pejorative name for the [[baron of Hell]], which is widely considered a non-challenging enemy in terms of the player's ability to evade its attacks versus its large amount of health. This makes many placements of the enemy act as a "meat wall," an obstacle that has to be removed by the player in order to progress forward.

* '''Dueler''' - A Doom community member who is most known for playing duels. While most tournament settings imply duels, some Doom players preferred this style of play outside of a tournament setting, and became known as "duelers".

* '''[[Dummy sector]]''' - A dummy sector is a sector in a map which is usually inaccessible or unseen to the player, but still serves a purpose. Dummy sectors can be used for special effects that otherwise would break. Notable examples are the imp closet in [[MAP01]], using a dummy sector for sound propagation, and the glowing tunnel room hiding the chainsaw secret in [[E1M2]], where a dummy sector is placed against the tunnel wall to power the lighting effect. Many of Boom's new editing features depend on dummy sectors.

* '''DWF''' - Abbreviation for the [[Doomworld]] Forums, one of the oldest surviving Doom forums, founded in 1998 along with its parent website, which formerly carried news and actively updated subhosted sites as well.

==E==

* '''[[EDF]]''' - A [[content definition language]] for the [[Eternity Engine]].

* '''[[Eternity Engine]]''' - An advanced [[source port]] that can render [[portal]]s. It can also play high-intensity maps such as those found in [[Sunder]] with a tolerable framerate. 

==F==

* '''Face rocket''' - Damaging yourself with rockets.

* '''[[Fake contrast]]''' - A feature of the [[Doom engine]] which allows orthogonal walls to be lit either brighter or dimmer than walls that are non-orthogonal, depending on the walls' direction. Highly visible in square map geometry such as crates. This feature primarily exists to increase contrast. Some source ports allow this to be disabled or "smoothed" across various angles. [[Hexen]] is notable for not having it at all.

* '''[[Fake floor]]''' - A lowered sector with no lower textures on its surrounding [[sidedef]]s, which causes the floor flat to bleed across as if there is no intervening sector. These can be used as traps by hiding monsters into the floor or to create various special effects.

* '''[[FDA]]''' - First demo attempt. A "blind run" of a map or set of maps in which the player plays to completion regardless of performance.

* '''Flags''' - Usually a numeric value for source ports which sets binary switches to enable/disable certain features. Common phrases include "[[DMFlags]]," short for "deathmatch flags", and "compflags," short for "compatibility mode flags." Flags can also refer to certain map editor parameters, used to set specific characteristics for [[linedef]]s, [[thing]]s, and [[actor]]s.

* '''Flat detailing''' - The use of additional sectors on floors to give a sense of an uneven or damaged floor. Used primarily on hexagon tiles, and was a fad in the mid-2000s.

* '''Fog''' - An earlier method of [[light diminishing]] that hardware accelerated source ports used when advanced shading techniques were either unavailable or too GPU-intensive. Can also mean custom color light diminishing in source ports that allow this, such as ZDoom. Hardware fog was canonically added to the Doom engine in [[Doom 64]].

* '''[[Frad]]''' - A deliberate misspelling of "fraud." Popular [[IRC]] slang in the late 1990s and early 2000s.

* '''[[Frag]]''' - The act of killing another player's character in the game. Original id Software terminology as applied to games, this usage likely also coined by John Romero. The term originates in the military, where {{wp|fragging}} means to kill, alone or as part of a conspiracy, a fellow soldier, especially a superior officer. The word itself is shortened from {{wp|fragmentation grenade}}, which became a weapon of choice in many incidents during the {{wp|Vietnam War}}, a conflict plagued by the phenomenon.

* '''[[FraggleScript]]''' - A (mostly deprecated) scripting language for source ports invented by [[Simon Howard (Fraggle)]]. Was first featured in [[SMMU]], ''removed'' from the [[Eternity Engine]], and then ''added'' to [[GZDoom]].

==G==

* '''GA''' - Abbreviation for [[green armor]]; use is most common in the multiplayer community.

* '''Geezy''' - A nickname of [[GZDoom]], from a combination of how "GZ" is pronounced in {{wp|American English}}, and the southern hip-hop rapper {{wp|Young Jeezy}}.

* '''gg''' (or '''GG''') - An acronym for "good game" that is commonly used in video game culture. In classic Doom, it is typically stated during intermission in multiplayer. There is also the sarcastic "gg no re" variant, meaning "good game, no rematch".

* '''[[Ghost]]''' - Monsters with zero width and height, making them able to pass through walls and rendering them immune to most sources of damage. Usually created by an [[arch-vile]] resurrecting a crushed monster.

* '''Gib''' - As a verb, to cause an enemy to suffer a violent, dismembering death. As a noun, the various chunks and parts which result from that death. Short for giblets, a term for fowl innards. An original id Software term coined by [[Adrian Carmack]].

* '''git''' - The "development" version of a source port. The term is from {{wp|git}}, a revision control system for software. Usually used in sentences like "Use the latest git revision."

* '''Glide''' - A [[glide]] is accomplishing the movement of the player through 32-unit gaps via building up a large amount of momentum and bypassing clipping checks against intervening linedefs or by otherwise perfectly fitting through the narrow space. Some glides may be damage assisted, via enemy attacks or rocket explosions. A '''void glide''' is a similar phenomenon which causes the player to pass outside the intended bounds of a map. All of these can become sequence break maneuvers and are thus used by speed runners.

* '''Good at Doom''' (GAD) - A sarcastic description of a player accidentally blowing himself up, e.g. with a rocket. Originally {{dwforums|67872|coined by Xaser in 2012}}. 

* '''Gothic''' - A mapping style inspired by the [[GothicDM]] series, a main hallmark of which is intricate detailing. May or may not imply use of the GothicDM texture set as well.

* '''[[Gothic99]]''' - A deathmatch mapset known for its ridiculously detailed first level (to the point where it was unplayable on some computers at the time), and often held up as one of the first instances of "over-detailing." For a few years, most mappers did not want to be associated with "Gothic99" levels of detail, and would state this explicitly. If a map is described as "Gothic99-ish," it is usually not meant as a compliment.

* '''[[Grab]]''' - Also known as a "bump", a grab is a technique used to collect items that are otherwise inaccessible. By exploiting a flaw in the collision code, a player can collect items through solid walls or across ledges. This effect is achieved usually by straferunning. The most famous grab is the "plasma bump" in [[Doom II]]'s [[MAP01: Entryway]] during [[deathmatch]], where the [[plasma gun]] can be picked up by running with speed into the raised platform upon which it sits. Some PWADs may require this technique to progress or reward advanced players.

==H==

* '''Heh''' - Originally an interjection for expression of sorrow or surprise, first attested in the mid-fifteenth century. It eventually morphed into a term for light laughter by the 1800s. It is a dominant form for expression of amusement on [[IRC]], next to the equally popular "lol." Later (mis-)appropriated for use in {{wp|SMS language|txt}}.

* '''Helled''' - A thread on Doomworld forums was sent to Post Hell with extreme prejudice.

* '''[[Hitscan]]''' - Attacks in Doom that are not projectiles - they immediately register a hit on a wall or a thing. A "hitscanner" is a monster that uses hitscan attacks.

* '''*hits blunt*''' - Usually precedes long or rambling posts on Doomworld, mostly in the Everything Else subforum. Started when the Doomworld forum admins made user GoatLord's posts in the Everything Else forum be automatically be preceded by it, to be seen by everyone except GoatLord himself.

* '''HK''' - Abbreviation for [[Hell knight]].

* '''HMP''' - [[Hurt me plenty]] skill level.

* '''HNTR''' - [[Hey, not too rough]] skill level.

* '''[[HOM]]''' - Short for "hall of mirrors", a shimmering, mirror-like effect that occurs due to the no-clipping [[Doom cheat codes|cheat code]], missing textures, or malformed nodes. Some source ports have "HOM detection" which blinks colors if any HOM is in the frame. The shimmering is no longer visible in many source ports, due to its dependence on the low-level behavior of {{wp|VGA}} video hardware.

* '''HR''' - Short for [[Hell Revealed]]. HR2 similarly stands for [[Hell Revealed 2]].

* '''[[Hub]]''' - A set of maps that can be visited and revisited in a non-linear order, as seen notably in [[Hexen]] and [[Strife]].

* '''[[HUD]]''' - Short for heads-up display, a term co-opted from the military by first-person shooter games. May also refer to the [[status bar]] or a different display entirely.

==I==

* '''Illusio-pit''' - A term invented by the author of [[Wow]], named one of the [[Top 10 Infamous WADs]] by Doomworld, for the fake floor effect created by missing lower textures around the perimeter of a sunken sector, which causes the flat of the surrounding higher sector to bleed across it. While originally invented in jest, the neologism has found serious use as a term for legitimate uses of this level construct, which predate Wow with initial appearances as a special effect as early as {{timeline|1994}}.

* '''[[InstaDoom]]''' - A mod for Doom that allows taking selfies in-game with various filters. Due to its widespread popularity and significant coverage given to it in mainstream and gaming press, a few believed that Instadoom was the {{wp|Eternal September}} of the Doom Community, and left the scene. There seems to be some sort of pattern, here.

* '''IOS''' - Abbreviation of [[Icon of Sin]].

* '''[[Impse]]''' - A graphic adult fan fiction about a marine, his imp, and a berserk pack. Had a sequel called ''Mancse'' which was not as enduring in popularity. Named after the shock image site {{wp|Goatse.cx|goatse}}.

* '''ITYTD''' - [[I'm too young to die]] skill level.

==J==

* '''[[Joke WAD]]''' - Any WAD with humorous elements which may or may not impact gameplay. There may or may not be any traditional gameplay contained in them. There are usually a lot of community references in joke WADs, including cameos of various Doom community members. Not to be confused with a [[Terry]] WAD.

== K ==

* '''KDIZD''' - Short for [[Knee-Deep in ZDoom]], a significant 2007 mod release and Cacoward winner for [[ZDoom]] which consists of a remake of the [[shareware]] episode of Doom, [[Knee-Deep in the Dead]], using advanced mapping features.

==L==

* '''[[Limit removing]]''' - Describes a map that runs in [[source port]]s which extend [[static limit]]s.

* '''Looks like Christmas''' - Originally the description of the [[BFG 2704]]'s plasma fire by [[John Romero]], due to its combination of red and green projectiles. Also referred to by [[Midway Games]] map designer [[Randy Estrella]] as a lighting scheme to be avoided in [[Doom 64]]. It can be used to describe texture choices that complement each other to the point of clashing and being overbearing (e.g., a green wall with a red floor).

* '''Longtics''' - A modified demo format that retains turning precision lost during normal (shorttic) demos.

* '''Longwall''' - Also known as "long wall." Slang for [[long wall error]], a phenomenon in which walls wobble about due to the limited precision of Doom's renderer. Most source ports fix this issue. If you have a long wall in your map, split it up using vertices until you are satisfied. However, beware of a [[static limit|drawsegs overflow]].

* '''Loser''' - A term for a [[Doomworld]] Forums member that had been put in time out due to their misbehavior. Losers were not able to post in any forums but the Losers forum, which was only visible otherwise by administrators, moderators, and a handful of Doom community veterans. A member who had been sent to Losers was said to be "losered". Losers might lose their custom forum titles as punishment. 

* '''[[Lump]]''' - A single asset in a WAD file. Can be a texture, marker, sound, map element, or any other type of data.

==M==

* '''Magnum opus syndrome''' - A trope which describes the tendency of some mappers of submitting, occasionally, overly long maps to certain community projects, presumably to make them stand out from the rest of maps. It is accepted that [[MAP12: Black Rain (Community Chest 3)|Black Rain]] (MAP12 of [[Community Chest 3]]) might be the codifier of this trope.{{cite web|author=[[Not Jabba]]|title=Top 100 Memorable Maps 100-91|url=https://www.doomworld.com/25years/top-100-memorable-maps/page01|publication=Doomworld|publishdate=10 December 2018|accessdate=31 December 2021}} The term is an ironic usage of [[wiktionary:magnum opus|magnum opus]].

* '''Map pack''' - A collection of maps in a single [[PWAD]] file. Also known as a '''mapset'''.

* '''Max''' - A "maximum" Doom speed run demo. Usually 100% kills and secrets, though items can also be considered. Example: "UV Max" meaning attainment of a 100/100 score in the Ultra-Violence [[skill level]].

* '''[[MBF]]''' - Short for Marine's Best Friend, it is a [[source port]] created by [[Lee Killough]] in 1998 after he left the [[Boom]] team.

* '''[[MBF21]]''' - A specification and standard specifically aimed at mod authors and mods in general. It builds on top of the possibilities shown in the [[Boom]] and [[MBF]] [[source ports]]. It defines a new [[Source_port_parameters#-complevel_.3Ccompatibility_level.3E|compatibility level]], {{c|-complevel 21}}, to introduce a range of new features that seeks to improve the capabilities available in levels and mods, to be implemented in various source ports. 

* '''Meatball''' - A food item with a brown, lumpy, round appearance, which invites comparison to the [[pain elemental]]. The term is sometimes used as a nickname for the monster as a result of the similarity.

* '''[[Medusa effect]]''' - A vanilla glitch texture effect that displays when a middle texture of a two-sided linedef has more than one [[patch]].

* '''[[Megawad]]''' - A large collection of maps in a single PWAD. By the [[idgames archive]] definition, a WAD must contain 15 or more levels to qualify, though [[SIGIL|usage has varied]]. While the original origin of the term cannot be known with certainty, on October 3, 1994, Nathan Lineback compiled a full 27-map replacement for Doom called MEGAWAD. "mega-WAD" was used by [[Denis Möller]] of [[The Innocent Crew]] in 1995 to describe the Memento Mori project. By 1996, [[Yonatan Donner]] used the word "megawad" to describe his upcoming project, Hell Revealed. By 1997 the word was in common usage within the Doom community.

* '''Mid-tex''' - Short for middle texture, most often referred to that of a two-sided linedef.

* '''MM''' - Short for [[Memento Mori]], a famous PWAD. Popular with speed runners. MM2 similarly stands for [[Memento Mori 2]].

* '''[[Monster closet]]''' - A small portion of a level that contains one or more enemies and is initially sealed off from the rest of the map, usually serving as a remotely triggered trap. Often used with a negative connotation; this element of gameplay as it appears in Doom and elsewhere is popularly derided for being unimaginative, unrealistic, or immersion-breaking.

* '''MS''' - Abbreviation for [[megasphere]]; use is most common in the Russian community.

* '''[[MUS]]''' - [[DMX]] music format used by Doom, similar to [[MIDI]].

==N==

* '''Needs more detail''' - A running gag in the Doom modding community, usually in response to a map that has more detail than needed to convey a sense of place.

* '''Nickbakery''' - Nonsense. Formerly implied an "overreaction to drama," but use in this sense has been lost. Term references [[Nick Baker (NiGHTMARE)]].

* '''Nilla''' - Shortened form of [[vanilla Doom]].

* '''Node''' - A "leaf" or branching point of a tree - more specifically, a [[BSP]] tree. You build "nodes" for Doom levels using a [[node builder]].

* '''NM''' - [[Nightmare!]] skill level.

==O==

* '''{{wp|OpenGL}}''' - A vendor-independent API for hardware-accelerated 3D graphics. Several source ports can use OpenGL, and other similar APIs, to provide rendering of Doom's game world as polygons. This allows support of a variety of features including higher color depth, perspective-correct [[mouselook]], dynamic lighting, and texture filtering. Often used in the sense of an alternative to "software", which is the process of rendering the game to a bitmap surface in the original manner, without 3D hardware acceleration support.

* '''[[OPL]]''' - A basic Yamaha FM synthesizer for the PC originally invented for the AdLib sound card and later adapted onto the SoundBlaster and compatibles. Some source ports are capable of emulating its unique sound in software.

==P==

* '''[[Pacifist]]''' - A style of play where the player must use no [[weapon]]s unless required to get to the exit, relying on [[monster infighting]] where necessary.

* '''[[Particle]]''' - A small rendered object, usually a single colored square, that is used for special effects in source ports. Popularized by the ''[[Quake]]'' series, particles may be used to simulate fluid-like effects such as blood, water, and projectiles. Particles are usually not regarded as [[thing]]s, but may be created by a spawner thing, such as a particle fountain. Source ports that support particles must be able to render many instances of them for a convincing effect.

* '''PC''' - Short for "[[partial conversion]]". A WAD that may contain new maps, sounds, and even sprites, but not to the extent of a [[total conversion]]. This may be subjective, however, as WADS like [[Back to Saturn X]] may replace nearly every asset but are still Doom themed, and therefore not frequently referred to as partial conversions.

* '''PE''' - Abbreviation for [[pain elemental]].

* '''PG''' - Abbreviation for [[plasma gun]]; primarily used in the multiplayer community.

* '''Piggy''' - An old term for a [[demon]]. Quickly fell out of use in favor of "pinky".

* '''Pinky''' - A demon; the term was popularized by [[id Software]] developers due to the monster's coloration. The [[Demon (Doom 3)|Doom 3]] version of the monster is officially named this despite no longer being pink. In the {{timeline|2016}} [[Doom (2016)|Doom]], on the other hand, they are again called pinkies while actually being pink. The name was also used for a character in the [[Doom movie]] who transforms into a similar monster.

* '''[[Pistol start]]''' - Playing each level in a set of maps with no weapons or [[power-up]]s acquired from the previous levels. Useful for testing custom maps. A required condition for many classes of speed runs.

* '''Player''' - A multiplayer newbie. The precise origin unclear, it is likely from the practice of many source ports with multiplayer functionality using "Player" as a handle by default. The term is rarely used in text, but more as a "sign" to identify those who have yet to configure their source port.

* '''[[PLAYPAL]]''' - The actual color palette for Doom. There are 14 palettes for Doom, including for damage, collection of items, and the green tinge of the [[radiation suit]]. If you change the PLAYPAL entries, you can display colors that were not in the original game.

* '''Plus''' - As in "Doom Plus," a binary patch for original Doom engine executables which extends [[static limit]]s by rearranging variables within the program's data segment in order to enlarge the involved arrays.

* '''[[Polyobject]]''' - A feature from [[Hexen]] and several source ports that allows to have some amount of horizontal geometry movement in an engine otherwise limited to pure vertical movement. Short for "polygon object", the name was further shortened to '''polyobj''' and then '''pobj'''.

* '''[[Portal]]''' - A source port feature which enables the player to see into another area in the map that would be either distant or occluded otherwise. These portals can make effects like room-over-room, or {{wp|MC Escher|Escher}}-style levels with never-ending hallways.

* '''Post a log''' - Predominantly found with the [[ZDoom]] and [[GZDoom]] source ports, as well as [[PrBoom]]. To "post a log" refers to the uploading of data about a crash, possibly along with the user's ZDoom or GZDoom {{wp|INI file}} or, in the case of PrBoom, the {{wp|Configuration file|CFG}} file and the {{wp|standard streams}} stdout and stderr, which hold several configuration parameters which can differ per use case and are thus unique. These files can be examined for troubleshooting.

* '''[[PrBoom+]]''' - Also known as [[PrBoom-Plus]]. A source port based on [[Boom]] which is popular with speed runners and has the largest range of demo compatibility out of all ports.

* '''[[Protip meme|Protip]]''' - Facetious or obvious advice pertaining to game play. Originally the name a side column feature in ''GamePro'' magazine, it was popularized as an {{wp|Internet meme}} via [[Andrew Stine (Linguica)]]'s creation of the protip image featuring the infamous caption, "To defeat the Cyberdemon, shoot at it until it dies." A notable usage continues in the form of a subscription-only emote in Dime's twitch channel.

* '''Purist''' - Refers to a person or a source port which is dedicated, possibly to the extent of fanaticism, to the purpose of playing Doom in the way that id Software apparently intended. For ports, this means implementing the game while changing nothing unnecessary in the course of porting it to its destination platform. For people, this indicates a rejection of {{cat|new features}} such as mouse look, jumping, and in some cases, even higher resolutions. See also '''vanilla''', for a similar term which lacks the ideological connotations.

* '''[[PWAD]]''' - Original [[id Software]] terminology. A "patch WAD," traditionally loaded with the -file command. [[John Romero]] insisted that this feature be adapted in order to support modding. The system was detailed accordingly by [[Tom Hall]] in the [[Doom Bible]] and implemented by [[John Carmack]], who liked making his games hackable.

==R==

* '''[[REJECT]]''' - A table used by the Doom engine for fast determination of which sectors can be seen from a given sector. For maps with many [[monster]]s, having a REJECT table can speed up the game by disregarding areas that cannot be seen from a monster's position. Creating a very accurate table can take a long time, and as of this writing, there is no perfect REJECT builder. Loses some advantage in modern source ports, where support of large maps causes the REJECT table to become a significant source of cache misses.

* '''The Revenant wears pants''' - A Doomworld Forums meme and humorous reference to the frequent belief by fans of the series that revenants, as they appear in Doom II covered with blood and gore, are wearing red shorts. This belief is sometimes influenced by the [[Doom novels]], whose authors apparently shared this conviction and wrote it into their story as such.

* '''Rip and tear''' - A meme that pays homage to the [[Doom comic]], which contains other one-liner gems such as "Sweet Christmas", "You have huge guts", "Who's a man-and-a-half?", "Here comes the night train!", and "Now I'm radioactive, that can't be good!"

* '''RL''' - Abbreviation for [[rocket launcher]].

* '''[[RNG]]''' - Abbreviation for {{wp|random number generator}}; use is common throughout games where randomness is a factor.

* '''[[Rocket jumping]]''' - Use of a rocket to fling the player into an area that would otherwise be inaccessible. Usually performed with walls, as Doom has no concept of vertical aim. ''[[Quake]]'' players may consider the Doom version of the move laughable, despite its versatility, due to the flashy vertical thrust and low splash-back of explosions in the ''Quake'' series of games. It is a proven speed running technique, however.

* '''Rocket punch''' - The act of closing to melee range to use the [[rocket launcher]] while under the protection of the [[invulnerability sphere]]. A particularly effective strategy in [[slaughter map|slaughter]] situations, and in multiplayer when the power-up is available. It ensures the targets of the attack take maximum splash damage from the rocket, as the rocket will be spawned partially inside the targets' hit boxes.

==S==

* '''Savescumming''' - Rapidly saving and loading progress while playing a difficult map at any time, or any map for the first time. There has been comical debate on whether or not excessive quick-saving and quick-loading is cheating, but can be seen as annoying during streaming. The term jumped to the Doom community from the western RPG gaming community, where {{wp|permadeath}} is a common mechanic.

* '''SG''' - Abbreviation for [[shotgun]].

* '''Shorttics''' - A demo in the original format, complete with decreased precision while turning.

* '''[[Skin]]''' - A special WAD file containing additional graphics for the player character, defined in a S_SKIN lump. Originally introduced in Doom Legacy as a fun way to distinguish between players in multiplayer, it was copied quickly into many popular ports. Many websites popped up to host skins during the late 90s, the most notable titled "The Epidermis Emporium". Skins fell out of favor in multiplayer in the mid 00s due to players abusing "joke skins" to hide into the scenery.

* '''Skins folder''' - Another term for an autoload folder. ZDoom added support for loading skins WADs through a skins subdirectory on startup - becoming, albeit unintentionally, an autoload folder - at a time when such functionality was not officially supported. Since most ports now have configurable autoload features, this is no longer used. The abuse of this feature became such an issue that most troubleshooting tips for ZDoom included some variant of telling the player to "remove all files in the skins folder".

* '''[[Slaughter map]]''' - A map focused around challenging gameplay in the form of overwhelming hordes of monsters, most notably mid-tier monsters. Most slaughter maps are made for [[Doom 2]] due to the larger monster roster.

* '''[[Slime trail]]''' - A vertical line of floor or ceiling texture that escapes the boundaries of its intended area, and draws on top of another floor. This is due to the flood-fill-like algorithm for drawing floors and ceilings interacting with inaccurate nodes or limited numeric precision in the Doom engine. Slime trails gained their name from an area of [[E1M1: Hangar]] in which a [[slime]] texture bled onto a raised concrete floor surrounding it.

* '''[[Slope]]s''' - Mapping feature which allows creation of ramps, inclines, and angled architecture. Initially adapted from Ken Silverman's BUILD engine; popularized by ZDoom.

* '''SMM''' - Abbreviation for [[spider mastermind]].

* '''Software''' - A rendering mode for a source port that supports a column-based rendering engine. "Software renderers" closely match the original renderer in Doom, and generally involve no hardware acceleration. Some PWAD text files may stress to the player to play the maps "in software."

* '''[[Source port]]''' - A custom version of Doom that runs on various platforms. May include extra features for modding or playing. Term was coined by the original back-port of [[Linux Doom]] to DOS, known as [[DOSDoom]]. The term expanded to include all source mods, even when no actual porting is taking place, over the objections of some programmers to its technical inaccuracy.

* '''Spam''' - A compressed volley of [[super shotgun]] or [[chaingun]] fire, [[plasma rifle]] shots, rockets, or BFG balls. Usually seen in deathmatch, it can be used to "blind" the opposing player in dark areas. "Spamming" can also be in the form of spreading projectiles by rapidly turning back and forth while firing.

* '''Sparklies''' - A nickname given to the stray pixels that can be seen when a plane meets a wall, or when a platform or floor is sectioned to show more than one flat. Notable examples include the final teleporter in E1M8, and any textured wall with a notable gradient in a sector the height of the texture. Sparklies occur due to lack of precision in the software renderer. Some source ports have special techniques to remedy these issues, but some opt to keep the original behavior due to adherence to the vanilla renderer, or simply for pure speed. A variant of sparklies were known to plague early hardware-accelerated source ports due to a phenomenon known as "t-junctions". This latter form of sparklies is also referred to as "space ants."

* '''SR-50''' - The fastest form of movement possible in the Doom engine, referring to "strafe run" combined with the speed of the player's motion in [[unit]]s per [[tic]]. See also [[SR-50 automation]], for a form sometimes considered to be cheating. 

* '''SS''' - Abbreviation for [[soulsphere]]; primarily used in the Russian community.

* '''SSG''' - Abbreviation for [[super shotgun]].

* '''[[STARTAN]]''' - The texture name of the iconic walls in [[E1M1: Hangar]] of Doom, originally inspired by the padded interior of the Millennium Falcon space ship of the {{wp|Star Wars}} franchise. Since it is a default texture for [[sidedef]]s in many map editors, liberal use of STARTAN may be seen as lazy.

* '''Stunlocking'''<span id="Stunlocking"></span> - Attacking a monster with a high enough rate of fire to continuously trigger its [[pain state]], which will result in the monster being locked in place and unable to retaliate. 

* '''SVN''' - The "development" version of a source port. Short for {{wp|SVN|Subversion}}, a revision control system for software. Usually used in sentences like "Use the latest SVN". Use is declining due to the increasing prominence of '''git''' for modern revision control.

* '''Swingshot''' - The belief that turning quickly while firing the [[super shotgun]] deals greater damage. Sometimes used superstitiously by competitive Doomers in a manner similar to a sporting ritual, this technique's effectiveness was debunked with the release of the [[Doom source code]], though it can still be used as an aiming method for some players in deathmatch.

== T ==
* '''[[Techbase map]]''' - A thematic style of mapping which emphasizes the use of high-tech devices and technological textures, as well as scientific or military bases. It is Doom's signature theme.

* '''Telefrag''' - The act of fragging an opponent or monster by [[teleport]]ing to his location, resulting in an instant, gory death.

* '''[[Terry]] WAD''' - A WAD specifically designed to piss you off, take up space, or do both. While some are simply screamers, others have been more malicious and may attempt to change the player's settings or use up significant disk space and memory. 

* '''THREE-DEE FUCKING FLOORS''' - A mockery of maps that used [[GZDoom]]'s [[3D floors]] to obnoxious ends. This would cause some players' computers to chug along at unplayable frame rates. The situation was compounded by the fact that ZDoom could not render 3D floors during this time, resulting in only a handful of players who had the hardware capable of rendering such maps being able to play them. Usage was mostly confined to the [[Skulltag]] forums, which are no longer active.

* '''[[Tic]]''' - Short for "tick", a single unit of time in the game logic. For the sake of brevity, Doom logic runs at around 35 tics per second. In [[vanilla Doom]], a frame is displayed to the screen every 35 tics if possible, thus Doom animates at 35 frames per second maximum.

* '''Tomato''' - a common nickname for a [[Cacodemon]].

* '''Torm''' - Adding detail to a map to the point of excess. Phrase comes from [[Tormentor667]], who some consider to have a reputation for obsessive detailing to the point of performance loss in game.

* '''TC''' - [[Total conversion]], or a WAD that replaces the majority of the maps, sprites, sounds, and either through [[DeHackEd]] or a [[content definition language]], the monsters and objects in Doom. The first famous TC, and the modification which first coined the term, was [[Aliens TC]].

* '''Transfer''' - Effects added as part of the [[Boom]] source port's editing features which require the setup of a "dummy" or reference sector or [[linedef]] from which properties will be transferred to another tagged structure in the map.

* '''[[Tutti-frutti effect]]''' - A vanilla glitch texture effect which can appear on walls. The texture is rendered distorted and there are often colors drawn which are not part of the original texture. These colors are the reason behind the name of the effect.

* '''Tyson''' - To complete a map, usually for a speed run demo, with the bare essentials needed to trigger lines and get to the exit. Usually this means restriction to the [[pistol]] and [[fist]] only, but in certain situations the [[chainsaw]] may also be acceptable.

== U ==

* '''UV''' - [[Ultra-Violence]] skill level.

== V ==

* '''Vanilla''' - [[Vanilla Doom]]. When describing a map, this means the map should run on the original unmodified Doom without problems.

* '''Vile''' - Short for [[arch-vile]].

* '''[[Visplane]]''' - A term from the source code for a data structure used to store and determine regions of the screen to paint as floors or ceilings. If a visplane is not cut off correctly due to imprecision in the renderer or bad [[node]]s, [[slime trail]]s occur. Notorious for being subject to a strict [[static limit]] based on the number of sectors in view with differing properties; a nefarious enemy of early Doom map creators. See also '''visplane overflow'''.

* '''[[Visplane overflow]]''' - An error in [[Vanilla Doom]] in which the game would crash due to exhaustion of available visplanes. This is because {{wp|static memory allocation}} was faster than {{wp|dynamic memory allocation}} on slow systems due to the reduction of cache misses (which would be seen as "hitches" during gameplay), and was seen as an acceptable sacrifice. During [[Doom II]]'s development, the number of visplanes was increased at request of [[id Software]]'s level designers. Modern source ports remove this limit through various methods.

== W ==

* '''Waggle''' - The term given to undulating floors in [[Hexen]] and source ports which borrow the feature from it. ZDoom extended the effect to be able to apply to ceilings as well.

* '''Wait for DoomScript''' - A historical phrase, often shortened to "WFDS", that was repeated to [[ZDoom]] forum users who requested a feature that would be difficult to implement in ZDoom. The lofty goal of DoomScript was to unify [[ACS]] and [[DECORATE]], which was later achieved by the [[ZScript]] language of [[GZDoom]].

* '''Wallhumping''' or '''wall humping''' - The player's action of moving along walls and constantly pressing the "Use" button, the goal of which is to discover a [[secret]] door or button.

* '''[[Wallrunning]]''' - The phenomenon of going faster by pushing against an orthogonal wall while moving. Can also be achieved using things, where it may be referred to as "thingrunning."

* '''Wand start''' - [[Heretic]]'s version of the [[#P|pistol start]].

* '''Wiggle''' - The term given to rendering errors on two-sided linedefs caused by the imprecise trigonometric lookup tables and fixed-point math used by the Doom renderer. This is observed in game as a "wiggle" along ledges and ceiling edges when walking alongside them.

== Y ==

* '''Y-shearing''' - A technical term for the side-effect of enabling [[mouselook]] in software renderers. Mouselook works by moving up or down the {{wp|viewing frustum}} of the player. Since software renderers are column-based and will always render walls parallel to the near and far plane of the frustum, this causes a "shearing" distortion effect comparable to the transformation effects of an {{wp|oblique projection}}.

* '''You are the demons''' - A meme popularized in the [[Doom: Repercussions of Evil]] fan fiction by Peter Chimaera, in which the protagonist suddenly and unexplainedly turns into a zombie at the end of the tale. The fanfic is notable for its many quotable lines and misspellings, to the point that some Doomers deliberately misspell terms in homage to it.

== Z ==

* '''ZDoomism''' - A term for common mapping errors that may appear when a mapper only tests maps in [[ZDoom]], without testing in other [[source port]]s. It can also be used as a term for the quirks ZDoom exhibits that other ports do not. Similar terms can also be used for other ports with idiosyncratic behaviors, such as the ironic "Chocolatism" referring to an unintentional deviation in [[Chocolate Doom]].

==References==
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