Sumo

is a form of competitive full-contact wrestling where a (wrestler) attempts to force his opponent out of a circular ring () or into touching the ground with any body part other than the soles of his feet (usually by throwing, shoving or pushing him down).

Robot-sumo (Japanese: ロボット相撲) is an engineering and robotics competition in which two robots attempt to push each other out of a circular arena, in a similar fashion to the sport of sumo. The robots used in this competition are called "sumo robots", "sumobots" or simply "sumos".

Annual Japanese festival

sumo played by women