Tang Yun and Jiyun: Pronounced dian. Refers to a notch or defect in a knife blade. Another interpretation is to hack or chop. Also, Jiyun: Pronounced dian (falling tone). Explained in the Explaining Graphs and Analyzing Characters (Shuowen Jiezi) as a defect or damage. The Book of Odes (Shijing) contains the usage: A flaw in a white jade tablet. According to the Jade Records (Yupian), this character is sometimes written in a variant form (dian). Zi Collection, Page Position: Lower Radical: Knife (dāo) Page 142, Entry 05