Hai Collection, Lower Volume Radical: Mouse (shǔ) Entry: Qi Kangxi Stroke Count: 28 Page 1529, Entry 35 Pronounced lei (rising tone). Another name for the flying squirrel. According to the Wings of the Erya (Erya Yi): The flying squirrel is also known as you, lei, feilei, or the qishu. According to the Book of Jin (Jinshu), the biography of Suo Jing: In the description of cursive script, it is said that leaping apes and flying qishu race and bound over one another.