Lifebuoy
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A lifebuoy or lifering is a life saving buoy designed to be thrown to a person in the water, to provide buoyancy, to prevent drowning.
The lifebuoy usually is ring-shaped or horseshoe-shaped and has a connecting line allowing the casualty to be pulled to the rescuer. They are carried by ships and are also located beside bodies of water that have the depth or potential to drown someone.
Lifebuoy was also a brand of soap.
In WWII a type of British army flamethrower was nicknamed a lifebuoy because of its doughnut-shaped backpack fueltank.