Boatswain's call

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Science and technology

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What Wikipedia says

A boatswain's call, pipe, or bosun's whistle is a pipe or a non-diaphragm type whistle used on naval ships by a boatswain.

Excerpt from the Wikipedia article “Boatswain's call”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: ThoKay 21:11, 18 August 2007 (UTC), CC BY-SA 3.0, via Wikimedia Commons.