Voodoo doll

A Voodoo Doll is the term used for when more than one "Player 1 Start" exist on the map in question in Vanilla Doom. Each extra Player 1 start will have a dormant player in its place. When these dormant players are attacked or damaged in any way, the actual player will suffer identical damage, hence the name "Voodoo Doll". These can be used for tricks on maps, such as "instant-death teleporters" for example.