Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Kyu is a Japanese term used in martial arts, chado, ikebana, go, shogi such as Japanese traditional culture, and academic tests and in other similar activities to designate various grades or levels or class of proficiency or experience. In China, kyu is called "ji", and it is used for academic tests. In 1882, Kano Jigoro, the founder of Judo, established the system of Dan ranking system to measure the Judo practitioners' ability. This system was referred to the Dan ranking system of Go which is a board game. Some organizations of academic tests started Kyu ranking system to measure the candidates' ability. On the other hand, Metropolitan Police Department in Tokyo started ranking system with using Kyu to measure the police officers' ability of Japanese sword arts. There were from 8th to 1st. At this time, dan and kyu are at the same level.

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