Buoy

A buoy (/ˈb.i, bɔɪ/)[1][2] is a floating device that can have many purposes. It can be anchored (stationary) or allowed to drift with ocean currents.

A sea lion on navigational buoy #14 in San Diego Harbor.
Green can #11 near the mouth of the Saugatuck River.
Green Can #11 on a nautical chart
NOAA Weather buoy

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