Rotor

Rotor may refer to:

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• the rotating part of a machine, as in a motor, generator, alternator, a pump or a helicopter. The part of the machine that does not rotate is called the stator.
• an electric motor designed to turn a receiving antenna to match the direction of the received signal.
• certain cipher machines, such as the German Enigma machine, made use of rotating wheels, see rotor machine.
• in US English, the disc in a disc brake.
• a part in a distributor.
• a fictional character from the Sonic the Hedgehog universe Rotor (Sonic the Hedgehog)
• the ROTOR radar project, the UK's 1st national air defence system following the Second World War, incorporating some Chain Home radar stations.
• Rotor, the code name for Microsoft's shared source implementation of the Common Language Infrastructure
• THE ROTOR is the trade name for an amusment ride.