Beacon tower
From Halopedia, the Halo wiki
Template:Ratings Beam Emitters are large tower-like structures on Halo. They shoot beams from one side of The rings to the other side to an identical Beam Emitter on the opposite side. They are likely used to transport energy for the Activation Process, or the activating of the Halo rings. They can be seen in the Halo: Combat Evolved level, Halo, and on the Halo: Combat Evolved cover. Similar structures that most likely share the same purpose can be seen in the Halo 3 multiplayer map Valhalla and in the Halo 2 multiplayer level Relic. If you manage to stand at the top of the chute in which the beam shoots from, the beam can either kill you, sending you over a hundred feet in the air, or completely pass through you.
