Sonobuoy

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Science and technology

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What Wikipedia says

A sonobuoy is a small expendable sonar buoy dropped from aircraft or ships for anti-submarine warfare or underwater acoustic research. The name is a portmanteau of sonar and buoy. Sonobuoys are typically around 13 cm (5 in) in diameter and 91 cm (3 ft) long.

Excerpt from the Wikipedia article “Sonobuoy”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: U.S. Navy photo by Photographer’s Mate 1st Class John Collins, Public domain, via Wikimedia Commons.