Wikipedia - "A frisbee (sometimes called a flying disc) is a disc-shaped gliding toy or sporting item that is generally plastic and roughly 20 to 25 centimetres (8 to 10 in) in diameter with a lip, used recreationally and competitively for throwing and catching, for example, in flying disc games. The shape of the disc, an airfoil in cross-section, allows it to fly by generating lift as it moves through the air while spinning. Frisbees are thrown and caught for free-form (freestyle) recreation and as part of many flying disc games. A wide range of frisbees variants are available commercially...."
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