Buoy

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A sea lion on navigational buoy #14 in San Diego Harbor.
MDS Weather Buoy / Data Buoy / Oceanographic Research Buoy

A buoy is a floating object that can have many different purposes, which determine whether the buoy is anchored (stationary) or allowed to drift. The word is most commonly pronounced ([bɔɪ]) (as in buoyant), but in American English it is often pronounced [ˈbu.i].