Xu Collection, Upper Volume Radical: Metal (jīn) Aluminum Kangxi Stroke Count: 15 Page 1306, Entry 20 Jade Chapters (Yupian): Same as the character meaning to polish or file (lü). Explanations of Symbols (Boya): Aluminum is called a polishing tool (cuo). Yangzi Dialect Dictionary (Fangyan): In the Yan and Qi regions, rubbing with aluminum is called xi. Annotation: Aluminum is pronounced lü.