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
Japanese martial arts the most prestigious weapon. Another trend that developed throughout Japanese history was that of increasing martial specialization as society became more stratified over time. The martial arts developed or originating in Japan are extraordinarily diverse, with vast differences in training tools, methods, and philosophy across innumerable schools and styles. That said, Japanese martial arts may generally be divided into "koryū" and "gendai budō" based on whether they existed prior to or after the Meiji Restoration, respectively. Since "gendai budō" and "koryū" often share the same historical origin, one will find various types of martial arts (such as jujutsu, kenjutsu, or