<title>trigger_once</title> # trigger_once A simple trigger volume that fires once and then removes itself. ### Keyvalues **Name (`targetname`)** >* The name that other entities refer to this entity by. **Tags (`tags`)** >* A list of general purpose tags for this entity, for interactions with other entities such as triggers. **Activation Tags (`activationtags`)** >* Entities with these tags can activate this trigger. **Enabled (`enabled`)** >* Whether this entity is enabled or not. ⤶ **Shadow Casting (`enable_shadows`)**⤶ ⤶ >* Whether this entity should cast shadows or not.