Rotor

Rotor (rotating part) may mean:

In engineering:
Helicopter rotor, the rotary wing(s) of a rotorcraft such as a helicopter
Rotor (electric), the non-stationary part of an alternator or electric motor, operating with a stationary element called the stator.
ROTOR, a former radar project in the UK following the Second World War
Rotor (turbine), the rotor of a turbine powered by fluid pressure
Rotor (brake), the disc of a disc brake, in U.S. terminology
Rotor (distributor), a component of the ignition system of an internal combustion engine
Rotor (engine), the rotary piston in a rotary combustion engine
Rotor (antenna), an electric motor that rotates an antenna to the direction of transmission or reception
Rotor (magazine), a US magazine covering the civil helicopter industry

In computing:
Rotor machine, the rotating wheels used in certain cipher machines, such as the German Enigma machine
Rotor (software project), the former code name for Microsoft's shared source implementation of its Common Language Infrastructure

In music:
 Rotor (band), a German progressive stoner rock band
 Rotor Plus (sometimes known as Rotor), an experimental electronica band from New Zealand

In other fields:
SC Rotor Volgograd, a Russian football club
Rotor (Sonic the Hedgehog), a fictional character from the Sonic the Hedgehog universe
Rotor (ride), the trade name for an amusement ride
Rotor (meteorology), a turbulent horizontal vortex that forms in the trough of lee waves
Rotor (mathematics), an n-blade object in geometric algebra, which rotates another n-blade object about a fixed or translated point
Rotor (planet), a planet in Isaac Asimov's book Nemesis
Rotor (game), a game written for the Commodore Amiga computer