十天干

shítiāngān
the ten Heavenly Stems 甲 jiǎ, 乙 yǐ, 丙 bǐng, 丁 dīng, 戊 wù, 己 jǐ, 庚 gēng, 辛 xīn, 壬 rén, 癸 guǐ (used cyclically in the calendar and as ordinal number like Roman I, II, III)

CEDICT

Entry Composition

1 十 shí
  1. ten
  2. 10
2 天干 tiāngān the 10 heavenly stems 甲 jiǎ, 乙 yǐ, 丙 bǐng, 丁 dīng, 戊 wù, 己 jǐ, 庚 gēng, 辛 xīn, 壬 rén, 癸 guǐ, used cyclically in the calendar and as ordinal numbers I, II etc