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°