Dan (rank) is by far the most recognizable symbol to the general public. The highest dan ranks are sometimes reserved for the founder or leaders of a style and only high-ranking students can be promoted to them. For example, only five living people hold a tenth dan in judo and only about thirty-five worldwide have been promoted to the rank since its inception; of those 10th dan promotions only fifteen were conferred by the Kodokan, all of them to Japanese judoka. This has led to upper level ranks becoming extinct in some arts. In other styles, the dan ranks are not the
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