Chen Collection, Middle Volume Radical: Tree (mù) 榫 Kangxi strokes: 14 Page 544, Entry 08 Collected Rhymes (Jiyun) states it is pronounced sun (rising tone), which is the same pronunciation as the word for bamboo shoot. It refers to the part of a piece of wood that is carved to be inserted into a hole. Notes on Meanings (Mingyi kao) by Zhou Qi, quoting the Recorded Sayings of Cheng Hao (Cheng Hao Yulu), states: The mortise and tenon are what constitute the sun and mao. If the mortise and tenon are circular, then they are circular; if the mortise and tenon are square, then they are square. Additionally, Sea of Documents (Pianhai) states it is pronounced zhun (rising tone). The meaning is the same.