Xu Collection, Upper Volume Radical: Metal (jīn) 鐁 Kangxi strokes: 20 Page 1321, Entry 28 Pronounced si. It is a tool for planing wood. Interpretation of Names (Shiming): The term si denotes something that smoothens. Because an axe leaves uneven marks when cutting, this tool is used to scrape and level the surface. Jade Chapter (Yupian): This character was originally written in a variant form (xi).