The obi (帯) is a cloth belt traditionally used in Japanese clothing to secure garments. In martial practice, the obi initially served a practical function, holding the gi in place during movement. Its association with rank and progression developed in the modern era, particularly through judo and karate, where colored belt systems were introduced to indicate experience and advancement. Beyond ranking, the obi represents perseverance and accumulated training, serving as a visible record of a practitioner’s ongoing commitment to discipline and self-cultivation.