BOOM

1) Vertical scaffolding pole (usually 48mm diameter) on which horizontal boom arms can be mounted, carrying lanterns. Often used behind wings for side-lighting etc. Booms have a base plate or stand at the bottom and are tied off to the grid or fly floor at the top (not always necessary for short booms). Booms can also be fixed to the rear of the procenium arch (Pros. Boom) or hanging from the ends of lighting bars. Sometimes known in the US as a light tree. A light tree mounted upstage of a Tormentor is known as a Torm Tree. 2) An arm mounted on a microphone stand.

The horizontal metal tube (usually 48mm in external diameter) hung from flying lines (or forming part of a grid) from which lighting equipment and scenery etc. may be suspended. Also known as a Barrel. When vertical, known as a Boom. Sometimes known as a Pipe in the US, although many curse that usage, and demand the use of Batten ; "A pipe is what you smoke; a batten is what you hang your instruments from."