Hai Collection, Upper Volume Radical: Bone (gǔ) Entry: Pin Kangxi stroke count: 24 Page 1451, Entry 01 Pronounced bin (rising tone) Pronounced bin (rising tone) Same as pin (kneecap). Shuowen Jiezi (Explaining Simple and Analyzing Compound Characters): The end of the knee. Comprehensive Discussions in the White Tiger Hall (Baihu tong): Pin refers to the removal of the kneecap. Records of the Grand Historian (Shiji), Biography of Zou Yang: Sima Xi had his kneecaps removed in the state of Song. History of the Former Han (Qianhan shu), Treatise on Law: The penalty of kneecap removal is one of the five hundred punishments.