Wu Collection, Lower Volume Radical: Stone (shí) Kangxi Strokes: 20 Page 838, Entry 01 Pronounced li (falling tone). Book of Documents (Shangshu), Feishi chapter: Sharpen your blade. Commentary: It is a whetstone. Correct Meaning: The term li refers to coarse stones; therefore, a whetstone is finer than a coarse sharpening stone. Jade Chapters (Yupian): The stone from Mount Yantizi can be used to sharpen blades. Analytical Dictionary of Characters (Shuowen Jiezi): In the classics, it is generally used interchangeably with the character li.