The Japan Sumo Association (日本相撲協会 or Nihon Sumo Kyokai) is the body that operates and controls professional
sumo wrestling in
Japan. Membership is by purchasing, or inheriting a share in the Association, of which there are 105. The value of these shares is extremely high and rules only permit them to be purchased by former sumo wrestlers who either reached at least a
sanyaku rank (
komusubi and higher) or been ranked for a significant number of tournaments as a
sekitori. Each share is associated with a particular name and in the sumo world the former wrestler will be known by that name, usually with the suffix oyakata. The members are also often called elders in English.
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