Jisho

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Noun
1. ranking system based on dan and kyu (in martial arts, go, shogi, etc.)See also , See also
Wikipedia definition
2. Dan (rank)The dan ranking system is a Japanese mark of level, which is used in modern fine arts and martial arts. Originally invented in a Go school in the Edo period, this system was applied to martial arts by Kanō Jigorō, the founder of judo and later introduced to other East Asia countries. In the modern Japanese martial arts, holders of dan ranks often wear a black belt, those of higher rank may also wear red-and-white and red belts.
Read “Dan (rank)” on English Wikipedia
Read “段級位制” on Japanese Wikipedia
Read “Dan (rank)” on DBpedia

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