Chen Collection, Middle Volume Radical: Wood (mù) Entry: Er Kangxi strokes: 16 Page 551, Entry 19 Pronounced er (falling tone). Shuowen Jiezi (Explanation of Simple and Compound Characters): Refers to the sour jujube tree. Erya (Approaching Elegance), Interpretation of Trees: Er is the sour jujube. Annotation: The tree is short and small, and the fruit tastes sour. Mencius (Mengzi): Cultivating the sour jujube and brambles there. Also pronounced zhi (falling tone). Refers to using wood to block a carriage wheel.