A latch intended for installation in a circular hole in a door.

1. The inside diameter of a pipe, valve, or other fitting. 2. The circular hole made by boring.

A horizontal strip of lights, hung parallel to the proscenium of a theater; used to provide general stage illumination.

In a theater, a strip of material which is stretched horizontally over the top of a stage, usually on rigging;

A horizontal metal plate set in a small frame, once located near the front steps of most buildings; used to

The flange and metal casing around a pipe that passes through a roof.