Meanings

1. first of the ten Heavenly Stems 十天干[shí tiān gān]
2. (used for an unspecified person or thing)
3. first (in a list, as a party to a contract etc)
4. letter 'A' or roman 'I' in list 'A, B, C', or 'I, II, III' etc
5. armor plating
6. shell or carapace
7. (of the fingers or toes) nail
8. bladed leather or metal armor (old)
9. ranking system used in the Imperial examinations (old)
10. civil administration unit in the baojia 保甲[bǎo jiǎ] system (old)
11. ancient Chinese compass point: 75°