Porta
From Halopedia, the Halo wiki
The Porta[1] is a "sphincter-like orifice" embedded in the floor that acts as the Flood analog to doorways.
Portas were sighted in the Flood-infested High Charity[2].
References
- ^ Halo 3: The Official Guide, page 99
- ^ Cortana (Level), Halo 3