A vertically-mounted Bar on which lanterns may be mounted. This often takes the form of a piece of scaff in a Tank Trap, which provides a floor mounted version. They are used in various types of production to provide sidelight positions.

Also a boom microphone, used in video to aim the microphone where desired during moving action, while also keeping it out of shot, operated by a Boom Operator. The microphone frequently has a windjammer (a.k.a fluffy, badger) over it (a popular brand is Rycote).

Boom Microphone

Boom Operator

Also the top part of a Microphone Stand, as famously detached by Freddie Mercury:

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