(literary) the nine musical modes used in traditional Chinese music, specifically in ancient opera and vocal music; also known as 南北九宫 nán​běi​jiǔ​gōng

short form of 九宫格 jiǔ​gōng​gé, a grid used for practicing calligraphy or as a template for positioning characters; also used to refer to a Sudoku grid

the area on a Chinese chess board consisting of nine points marked with a diagonal cross where the general and advisors are restricted to move

(literary) the nine positions or directions in ancient Chinese numerology and divination, corresponding to the eight trigrams plus the center