plug

1. Noun. Plug can be a rather generic term for any small flat or flat unit that fits into a hole or gap in a wall of flats or scenery. Plugs are also employed as a way to back a section of scrim or projection screen in an otherwise solid wall. The plug is removed for the duration of the effect, then replaced afterwards. A related term from the film/TV industry would be "Wild Wall". Similarly, may also refer to an oddly-shaped platform often on the perimeter adjacent to stock-sized units.

2. Electrical or Signal. Noun. A line/cord-mounted wiring device having male pins or contacts for temporary connection intended to be inserted into a receptacle or connector. In some circles, a plug is always male, and a connector is always female, thus no such thing as a "female plug" or "male connector". "The plug goes into the jack!" Electrical contractors refer to a plug, such as a Hubbell 5266 (15A male Edison PBG/PBU), as a "cord cap".
2a. Verb. To insert or remove the above.

Both definitions may be exactly synonymous with, or slightly different than, patch. See also Patch, Types of (Lighting).