Forerunner teleporter
From Halopedia, the Halo wiki
The Forerunner Teleporter is a structure in Halo Wars that instantly sends units to another teleporter location. They are directly based off of Halo 2 and 3's teleporters, and function in the same way.
Forerunner Teleporters are seen only in the thirteenth mission of Halo Wars, Beachhead, and the multiplayer maps Blood Gulch and Labyrinth from Halo: Combat Evolved.