The term day (duan - in Chinese or Japanese dan) means degree or level, this term is used in most martial arts of Chinese and Japanese origin.

History of the term day

According to some sources, the term day was first used by Kano Jigoro, the founder of judo, who awarded titles to his students according to the level of knowledge and training and thus classified them by levels, over time this system evolved and reached the level we know today.

Today's application of the term day

Today, the term day is used for a karate practitioner who wears a black belt. The number of day levels varies from style to karate style in some styles the day level is from 1 to 9 or 1 to 10 and can be from 1 to 5. The highest day level in certain styles is set for the founder or founders of the style, so today in some styles the highest level of black belt was reached by a small number of exercisers.

It can be concluded that the level given as a method of degree in karate, although it has changed over time, has remained consistent with the original purpose and that in today's "form" is a very modern and advanced method.