"pipe : (music) A wind instrument consisting of a tube, often lined with holes to allow for..."

“pipe : (music) A wind instrument consisting of a tube, often lined with holes to allow for adjustment in pitch, sounded by blowing into the tube. […]
A rigid tube that transports water, steam, or other fluid, as used in plumbing and numerous other applications. […]
(Australia, colloquial, now historical) An anonymous satire or essay, insulting and frequently libellous, written on a piece of paper which was rolled up and left somewhere public where it could be found and thus spread, to embarrass the author’s enemies.”

- https://en.wiktionary.org/wiki/pipe#English

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