Wu Collection, Upper Volume Radical: Jade (yù) 璛 Kangxi Strokes: 17 Page 742, Entry 05 Pronounced su (falling tone). According to the Jade Chapters (Yupian), this is a surname. Additionally, according to the Collected Rhymes (Jiyun), it refers to a craftsman who carves jade. According to the Categorized Chapters (Leipian), it is also written in a variant form.