Rank in Judo are ranked in ascending numerical order. The ninth ("kudan") and tenth degree black belt ("jūdan") and, theoretically, those higher, have no formal requirements. Only 15 individuals have been promoted to the rank of Kōdōkan 10th dan. On January 6, 2006, three individuals were promoted to this rank simultaneously: Daigo Toshirō, Ichirō Abe, and Ōsawa Yoshimi. This is the most ever at the same time, and the first in 22 years. No one has ever been promoted to a rank higher than 10th "dan", but in theory the Judo rank system is not limited to 10 degrees of black belt. The
Dan (rank) the highest attainable rank. Unlike Judo, all "dan" promotion within the All Japan Kendo Federation, International Kendo Federation and its member countries is by examination. Whereas "dan" grades are awarded for technical ability, there is a parallel "shogo" system awarding the higher teaching grades of "renshi", "kyoshi", and "hanshi". "Renshi" and "kyoshi" are awarded by written examination while "hanshi" by election. Although the "dan" system is distinctly Japanese, it has been adopted by many other martial arts styles. The "dan" system and the well-known symbol of a black belt have been absorbed into common usage to represent a person with