Chen Collection, Middle Volume Radical: Tree (mù) Kangxi Strokes: 21 Page 562, Entry 33 Pronounced bo. In the Explanation of Characters (Shuowen Jiezi), it is defined as a wall column. In the Western Capital, it was called a wall sash; present-day people call it a partition column. One theory states it refers to a rafter. Also, in the Jade Chapters (Yupian), it appears in the term for a bracket system, defined as a bracket. In the Added Rhymes (Zengyun), it is defined as the support piece upon a column. In the Commentary on Miscellaneous Records (Liji Zaji Zhu), it is noted as a bracket carved in the shape of a mountain, known as a mountain-shaped joint, referring to the square wood atop a column. Also, pronounced bai. In the Classified Chapters (Leipian), it is noted as having the same meaning. Also, pronounced bo. In the Broad Rhymes (Guangyun), it is defined as the name of a type of tree. Also, pronounced bi. A wooden structural component on a door.