甲 jiǎ — first of the ten heavenly stems 十天干[shí tiān gān]

المعاني

1. 1

   first of the ten heavenly stems 十天干[shí tiān gān]

   first of the ten heavenly stems 十天干[shí tiān gān]; (used for an unspecified person or thing); first (in a list; as a party to a contract 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 (old)

   noun