Acronym for;

General Purpose Outlet
it is an electrical term. The definition for GPO in the AS3000 – Australian Standard for Wiring Rules is "three pin flat pin 10 amp socket outlet" or power point as commonly known. But now There is no GPO. the definition was removed from the 2000 edition of the wiring rules, those power points are now defined as Socket Outlets.

Group Policy Object
refers to computer networking

General Post Office
usually the main post office in the state.