Si Collection, Upper Volume Radical: Water (shuǐ) Suo Kangxi strokes: 16 Page 649, Entry 08 Pronounced cu (entering tone) According to the Explaining Graphs and Analyzing Characters (Shuowen), it means deep and clear. Also means fast. Zhang Heng, Thought Rhapsody (Si fu): The swift whirlwind rushes rapidly with me. Pronounced su (entering tone) The meaning is the same. Also a surname. According to the Comprehensive Record of Extraordinary Surnames (Qi xing tong), there was a Yanmen Commandery Governor named Suo He during the Han dynasty. Pronounced xiao Interchangeable with Xiao. Also interchangeable with Sou, meaning to wash rice.