A metal box built into the floor of the stage, either in the wings or extreme DS or US, with a lid, (usually hinged, but the one pictured below is removable). Inside this box you may find electrical circuits, audio lines, video lines, intercom lines, and in a newer theater you may even find Ethernet and fiber-optic connections. Also found in ballrooms, exhibit halls, and arenas.
An example for a lighting manufacturer:
(Notice the notches for cable entry.)
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