In "Liushu Gu" (Liushu Gu), it is the same as the character "xian". In "Zhengzitong" (Zhengzitong), the pronunciation of the character "huan" is the same as "xian", but it does not exclusively refer to the "yinu" insect. It should be based on "Zi Hui" (Zi Hui), and refer to both small clams and "yinu".