FOH

Front of House (abbreviated FOH) is a theatrical term, referring to the portion of the building that is open to the public. In theatre and live music venues, it typically refers to the auditorium and foyer, as opposed to the stage and backstage areas.

From: Front of House - Wikipedia, the free encyclopedia (5 July 2008)

In the concert and corporate worlds, FOH generally refers to the Sound Mix and Lighting Control position.