<title>trigger_once</title> # trigger_once A simple trigger volume that fires once and then removes itself. ⤶ ### Keyvalues⤶ ⤶ In code, it is defined in the `TriggerOnce.cs` file under `addons\base\code\Entity\Hammer\Triggers`.⤶ ⤶ ## 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.