What is an inflatable ring called?
A swim ring (also known as a swimming ring, swim tube, rubber ring, water donut, floatie, inner tube, or, in the united states, a lifesaver) is a toroid-shaped (hence the name ring or doughnut) inflatable water toy. A bubble ring, or toroidal bubble, is an underwater vortex ring where an air bubble occupies the core of the vortex, forming a ring shape. The ring of air as well as the nearby water spins poloidally as it travels through the water, much like a flexible bracelet might spin when it is rolled on to a person’s arm.
What are those floaty rings called?
A lifebuoy or life ring, among many other names (see § Other names), is a life-saving buoy designed to be thrown to a person in water to provide buoyancy and prevent drowning. Diameter Lifebuoy 600 This lightweight design makes it easy to carry across distances, although we do recommend siting the rings at regular intervals near bodies of water to reduce response time. Thanks to its smaller structure, the 24” lifebuoy can cover a large throwing distance of up to 10 – 15 metres.