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
The Canon of Judo mentioned. In the book, Kyuzo Mifune explains his metaphysical view of Judo, its role in Japanese society (and the world), and benefits to the individual player. He notes that Judo initially only included throws, and explains the difference between Judo and Ju-jutsu. He discusses the role of competition in Judo, and the purpose of free practice, randori, and explains that it is an indispensable part of the sport. Although the book mentions the five kata, it does not cover them. Furthermore, it does not cover Atemi-waza, but states that Atemi-waza include strikes, kicks, hits, and attacks using the fist, foot,