Kyū (Japanese: 級, [kʲɯː]) is a Japanese term used in modern martial arts as well as in tea ceremony, flower arranging, Go, shogi, academic tests and other similar activities to designate various grades, levels or degrees of proficiency or experience. In Mandarin Chinese, the same character 級 is pronounced jí, and the term is used for academic tests. In Korea, the term geup (급, 級) is used (also transliterated as gup or kup). In Vietnamese martial arts, it is known as cấp (khớp).
The dan (段) ranking system is used by many Japanese, Okinawan, and Korean martial art organizations to indicate the level of a person’s ability within a given system. Used as a ranking system to quantify skill level within a given set of specific patterns, it was originally used at a go school during the Edo period. It is now also used in most modern Japanese fine and martial art.