Dan (rank) highest level that might be attained, with instructor certification and judge/judgment authorization being understood as higher-level or more sophisticated. Many arts use between one and ten dan ranks: In some martial arts, black belts are worn for all "dan" grades. In others, the highest grade (10th "dan") wears a red colored belt. In Jūdo and Shotokan 6th to 8th "dan" may wear a red and white-patterned belt and 9th to 10th "dan" may wear a solid red belt. There is some variation even within styles. Generally, belts do not have markings that indicate the actual "dan" grade. Okinawan styles used
Judo in Canada be promoted after five years in the previous grade, but a 'good' candidate would have to wait eight. There have only been seventeen "judan" (tenth dan) judoka in history, fifteen promoted by the Kodokan and two by the International Judo Federation. None of them are Canadian, but Canada does have a group of more than 100 "kōdansha" (high dan holders), all of whom have devoted much of their lives to Canadian Judo. The late Yoshio Senda became Canada's first "kudan" (ninth dan) in 2007, and since then three more Canadians have been promoted to "kudan" by Judo Canada: Yeiji Inouye