Buoyancy compensator

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What Wikipedia says

A buoyancy compensator (BC), also called a buoyancy control device (BCD), stabilizer, stabilisor, stab jacket, wing or adjustable buoyancy life jacket (ABLJ), depending on design, is a type of diving equipment which is worn by divers to establish neutral buoyancy underwater and positive buoyancy at the surface, when needed.

Excerpt from the Wikipedia article “Buoyancy compensator (diving)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: BelowGive, Public domain, via Wikimedia Commons.