Chen Collection, Middle Volume Radical: Tree (mù) Yu (26 strokes) Page 564, Entry 21 Pronounced wu (entering tone). It sounds like the entering tone of yun. In the Explaining Graphs and Analyzing Characters (Shuowen Jiezi), it is written as yu. In the Broad Rhymes (Guangyun), it is a variant form of yu. It refers to a dense forest. It also refers to fragrant herbs. It further denotes breath, length, depth, blockage, or putrefaction. It also refers to distant thoughts. For a detailed explanation, please refer to the entry for the character yu. It also appears in the name Yulei, a deity. The Comprehensive Customs (Fengsu Tong) records: During the time of the Yellow Emperor, there were two brothers named Shentu and Yulei, who inspected ghosts under a peach tree on Mount Duso.