甲
- first of the ten Heavenly Stems 十天干
- (used for an unspecified person or thing)
- first (in a list, as a party to a contract etc)
- letter "A" or roman "I" in list "A, B, C", or "I, II, III" etc
- armor plating
- shell or carapace
- (of the fingers or toes) nail
- bladed leather or metal armor (old)
- ranking system used in the Imperial examinations (old)
- civil administration unit in the baojia 保甲 system (old)
- ancient Chinese compass point: 75°