Gatekeeper

• Literally, a Gatekeeper is a person who guards or monitors passage through a gate. When toll roads were in use in Britain the gatekeeper was responsible for manning the toll gates.
• Figuratively, Gatekeeper is used to mean a person or group who controls access to something or somebody.

• With reference to H.323 a Gatekeeper is an entitiy that manages a H.323 zone, providing address information/translation and other services to the terminals within the zone, and for Gatekeepers managing other zones.

• A Gatekeeper picks the best news, about 20 % and forward it to the newspapers.

• A Gatekeeper is a brown colored European butterfly in the sub-family Satyridae of the family Nymphalidae.

• In Final Doom, Gatekeepers are powerful, enormous and ancient demons that have the power to open Dimensional Gates and control/protect them.