ninth dan
The highest or a very high rank in many Japanese martial arts and board games. Often used as a title or honorific.
He is a ninth-dan master of judo.
九段の棋士が対局する。
A ninth-dan shogi player plays a match.
Compound of 九 (nine) and 段 (dan, rank). The dan ranking system was originally developed for go and later adopted by martial arts.