pound key

American  

[pound kee] / ˈpaʊnd ˌki /

noun

1. a push button on a telephone or key on a computer keyboard that is marked with a pound sign (#).

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Etymology

Origin of pound key

First recorded in 1990–95

Example Sentences

Washingtonians with questions can call the Snohomish County Health District between 9 a.m. and 6 p.m. daily at 425-388-5088, or call the state health department at 800-525-0127 and press the pound key.

From Seattle Times

Then it’s called the pound key. 

From Forbes

Although the assault on Benghazi has been halted, government troops have lost little ground and continue to pound key towns like Misratah and Zintan.

From Time

Please note that at any time during this message, you may press the pound key to stay on the line until Ajit finishes his orangeade.

From Time Magazine Archive