projected_wall_entity

In-game screenshot of a projected_wall_entity coming from a prop_wall_projector.

projected_wall_entity is an e0 available in Portal 2.

Warning:

• The {{{game}}} parameter is inconsistent with the name defined by the {{portal2}} template. This can most likely be fixed by setting the value of the {{{game}}} parameter to Portal 2.
  If a parameter is consistent but you're still seeing this warning, it may be an issue with the template itself. Please discuss it on the template's talk page.

This is the actual Hard light surface created by a prop_wall_projector. One put directly into a map behaves exactly like one made via a prop_wall_projector, just without the emitter model.