Chen Collection, Upper Volume Radical: Sun (rì) 暑 Kangxi stroke count: 13 Page 498, Entry 13 Pronounced shu. Shuowen Jiezi (Explaining Graphs and Analyzing Characters): Heat. Shiming (Explanation of Names): Shu means to boil. Heat like boiling things. Book of Changes (Yijing), Appended Remarks: The sun and moon move in their orbits; one is cold and one is hot. Zhengzitong (Comprehensive Compilation of Correct Characters): The seasonal regulations include Great Heat and Lesser Heat.