Kyu is a Japanese word that refers to a rank or degree in martial arts, specifically in disciplines such as Judo, Karate, and Aikido. However, there are several synonyms for Kyu based on the proficiency level they indicate. These synonyms include grades, levels, ranks, belts, and stages. Kyu rank is graded from 1st to 10th in ascending order of proficiency, with 10th being the lowest and 1st being the highest level. The term "gup" is used interchangeably with Kyu in Korean martial arts such as Taekwondo. In brief, Kyu is a vital and universal word in martial arts that has several synonyms today.