script_trigger_multiple

This entity is not in the stock FGD files by default. It should not be placed (in Hammer) because the entity already has a more accessible alternative.

Code classes:

• CScriptTriggerMultiple
• CTriggerMultiple
• CBaseTrigger (triggers)
• CBaseToggle
• CBaseEntity (all ents)

script_trigger_multiple is a brush entity present in Left 4 Dead 2. This entity is what trigger_multiple entities are converted into when a map is compiled into an entity group.