Xu Collection, Upper Volume Radical: Metal (jīn) Mu Kangxi strokes: 13 Page 1303, Entry 04 Correct in its usage according to the Zhengzitong (Proper Character Guide). Liu Zongyuan wrote the Record of Gu-Mu Pool in Yongzhou. In the Travel Records of a Carriage (Canluan lu) by Fan Chengda, it is noted that a gu-mu is an iron, and the pool is shaped like one.