甲

(of the fingers or toes) nail

(used for an unspecified person or thing)

ancient Chinese compass point: 75°

armor plating

bladed leather or metal armor (old)

civil administration unit in the baojia 甲 system (old)

first (in a list, as a party to a contract etc)

first of the ten Heavenly Stems 干

letter "A" or roman "I" in list "A, B, C", or "I, II, III" etc

ranking system used in the Imperial examinations (old)

shell or carapace