the 12 earthly branches 子 zǐ, 丑 chǒu, 寅 yín, 卯 mǎo, 辰 chén, 巳 sì, 午 wǔ, 未 wèi, 申 shēn, 酉 yǒu, 戌 xū, 亥 hài, used cyclically in the calendar and as ordinal numbers I, II etc