trigger_tractorbeam is a brush entity available in the following Source games:
Portal 2 and Portal 2: Community Edition. It is a trigger is emitted from a
prop_tractor_beam and works with a
projected_tractor_beam_entity to create an anti-gravity state for the player, and to pull/push the player away/towards the funnel model.
Warning:This entity will crash the game if manually created in Hammer!