Shen Collection, Upper Volume Radical: Grass (cǎo) Yu Kangxi Strokes: 15 Page 1042, Entry 37 Tang Rhymes (Tangyun) and Rhyme Collection (Yunhui): Pronounced yu (rising tone). Explaining Graphs and Analyzing Characters (Shuowen): Grass. Also a surname. Quick Reference (Jijiupian): Yu Duanqing. Commentary: Yu is also the character for yu (a type of tree). Yu is the name of a tree; the surname was derived from the tree. History of the Former Han (Qianhan): There was a Yu Zhang. Also Rhyme Collection (Yunhui): Pronounced ju (rising tone). Meaning the same. Also Collected Rhymes (Jiyun): Pronounced ju. That which is used to straighten a carriage wheel. Rites of Zhou (Zhouli), Winter Officers (Dongguan), Wheel Maker (Lunren): Use yu to straighten it. Commentary: This refers to a yulou used to rotate the top of the wheel; if the middle of the wheel has a yulou, then it will not be crooked.