#circle.rotating_mechanism__round  any circular or rotating mechanism; "the machine punched out metal circles"
  supertype:  #rotating_mechanism  a mechanism that rotates
  subtype:  #disk__disc  a thin flat circular plate
     subtype:  #acetate_disk__acetatedisk__phonograph_recording_disk  a disk coated with cellulose acetate
     subtype:  #brake_disk__brakedisk  the brake disk plate is fixed to the wheel; pressure is applied to it by the brake pads
     subtype:  #diaphragm  electro-acoustic transducer that vibrates to receive or produce sound waves
     subtype:  #discus.disk__saucer  a disk used in throwing competitions
     subtype:  #Frisbee  (trademark) a light plastic disk about 10 inches in diameter; sailed with a flip of the wrist for recreation or competition
     subtype:  #planchet__coin_blank  a flat metal disk ready for stamping as a coin
     subtype:  #hockey_puck__puck  a vulcanized rubber disk 3 inches in diameter that is used instead of a ball in ice hockey
     subtype:  #token  a metal or plastic disk that can be used (as a substitute for coins) in slot machines
        subtype:  #subway_token  a token that is used to pay for entry to the subway system

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