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 'forms of throwing') must be demonstrated during examinations beginning at "sankyū" (green belt). Finally, students are also expected to remain proficient in all techniques associated with their previous grades, and to develop an understanding of Judo's history and standard Japanese terms. The requirements for "dan" promotion are more demanding and cover age, time in current grade, points total, and how those points were earned. To test for black belt, a person must be at least 15 years old, have been an "ikkyū" (brown belt) for at least one year, been active in Judo for at least three years with a