Grandmaster (martial arts) of "Dan" rankings and Black belt and Red belt in martial arts both derive from Judo where they were adopted by its founder Kanō Jigorō. There are many terms similar or equivalent to 'grandmaster' used by various martial arts traditions. Some of these terms derive from older systems, while others are relatively modern. Japanese martial arts commonly use Sensei (先生) meaning "teacher" or literally translated, "born first" or "one who has gone before". A "Sensei" is a person who has knowledge and is willing to teach that knowledge to another. A "Sensei" assists students in "ken shiki" "the pursuit of
Aiki (martial arts principle) the best word or phrase available to them. In this way, there may be a divergence of the meaning between arts or schools within the same art. The characters "ai" and "ki" have translations to many different English words. Historically, the principle of aiki would be primarily transmitted orally, as such teachings were often a closely guarded secret. In modern times, the description of the concept varies from the physical to vague and open-ended, or more concerned with spiritual aspects. Aiki lends its name to various Japanese martial arts most notably aikido and its parent art, Daito-ryu aiki-jujutsu. These arts