Hai Collection, Lower Volume Radical: Rat (shǔ) Kangxi stroke count: 22 Page 1529, Entry 25 According to the Zhengzitong (Proper Character Guide), this character is identical to the variant form (yǎn). According to the Bencao (Compendium of Materia Medica), one type is called the field mouse. Another type is called the mole-rat. Another type is called the hidden mouse. According to Li Shizhen, the field mouse crawls beneath the ground and is capable of piling up soil to form small mounds, which is how it acquired these names. Detailed explanations can be found in the entry for the variant character (yǎn).