Nihon Sumō Kyōkai 日本相撲協会
The Japan Sumo Association, which runs professional sumo.
The Nihon Sumō Kyōkai is the Japan Sumo Association, usually shortened to JSA. It runs professional sumo, from the six tournaments a year to the banzuke published before each one. It also keeps the official list of 82 winning techniques. Its present form dates from December 1925, and it became a public interest foundation in 2014.
We haven't yet checked this kanji against the Japan Sumo Association's own pages.