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 judo are that judoka with visual impairments take hold of their opponent before the start of the match, and the mat has different textures to indicate zones and the competition area. Judo for the visually impaired has a long history in Canada and, according to a newspaper article published in 1952, Ottawa was the home of the only judo club for the blind in the world at the time. In most circumstances, however, visually impaired and sighted judoka belong to the same clubs and practice together. Canada was first represented in international competition by brothers Pier Morten and Eddie Morten