Si Collection, Upper Volume Radical: Water (shuǐ) Page 660, Entry 14 Pronounced wei. Wei-wei refers to the appearance of a school of fish swimming in succession. Another source states that a dense school of fish is called wei. Another source describes the appearance of flowing water. Commonly written as the character wei. Also written as yi. Another source in the Collected Rimes (Jiyun) suggests it refers to a liquid like grease or fat. Pronounced dui. Wei refers to the appearance of water ripples and sand or stones being agitated by the water. In the Rhapsody on the Yangtze River (Jiang Fu) by Guo Pu, it is written as: Green sand flows to and fro. Sometimes written with the radical for mound as tui. Pronounced du. The meaning is the same.