About
HSK levels

    jiǎ

    1. first of the ten Heavenly Stems 十天干[shi2 tian1 gan1]
    2. (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
    3. armor plating; bladed leather or metal armor (old)
    4. shell or carapace; (of the fingers or toes) nail
    5. ranking system used in the Imperial examinations (old)
    6. civil administration unit in the baojia 保甲[bao3 jia3] system (old)
    7. ancient Chinese compass point: 75°

    甲骨文是中国最古老的文字系统。 jiǎ gǔ wén shì zhōngguó zuì gǔlǎo de wénzì xìtǒng.