baseprojectile

This entity is not in the FGD by default.
It should not be put directly in a map.

Class hierarchy
CBaseSpriteProjectile ↳CSprite ↳CBaseEntity
cbasespriteprojectile.cpp

baseprojectile is a point entity available in all  Source games except  Left 4 Dead series and  Counter-Strike: Source. It is a base class for sprite-based projectiles. It seems to have never been used for anything in Half-Life 2.

Risk of Confusion:This entity should not be confused with CBaseProjectile, which is tied to proj_base.