The term 'Judo Belt' refers to the colored belt worn by practitioners of the martial art Judo. The belt is typically made of cotton and is used to indicate the rank of the practitioner. The color of the belt can range from white to black, with each color representing a different level of expertise. The term 'OBI' is a three-letter acronym that stands for 'Orthodox Belt of Inoue, ' which is the name of the Japanese company that manufactures Judo belts.