info_null
 class hierarchy
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| CNullEntity |
info_null is a point entity available in all 
Source games.
It is removed as soon as it spawns. It is primarily useful as a target for pointing lights at. Another possibility is to use it during map development as a way of keeping location-based notes within the VMF file, using the entity's comments box.
Because this entity isn't removed on compile, it still counts toward the entity limit until removed on map spawn.
