Clip

A clip is a gray (or steel) weapon magazine containing 10 bullets, ammo for the pistol or the chaingun (20 on the I'm Too Young To Die and Nightmare! skill levels). The clips dropped by defeated zombiemen and SS Nazis contain only 5 bullets each (10 on ITYTD and NM) and, unlike preexisting clips, disappear when crushed beneath doors or moving ceilings.

Each bullet does between 5 and 15 hit points of damage (determined using Doom's pseudorandom number generator). Note that, although shots fired by zombies and the Wolfenstein SS inflict only 3-15 points each, the bullets in their dropped ammo clips behave like any other bullets when used by the player.

Although referred to as s in the game, the items depicted are more properly known as s; that is, they contain bullets rather than merely hold them in place.

Appearance statistics
In the IWADs the clip is first encountered on these maps per skill level:

The IWADs contain the following numbers of clips per skill level (excluding those of dead former humans):

Doom RPG
In Doom RPG, the clip is called a bullet box. It gives the player either 4 or 10 bullets.