A type of swim ring designed to be thrown to a person in the water to prevent drowning.
It differs from an innertube because it is often made of solid buoyant material (rather than being air-filled), and is usually orange or red-and-white in color to maximize visibility in the water. It also may have a line to pull the person holding onto it.
The term "life buoy" is most common in British English. In American English these are better known as "life preservers".
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