Zi Collection, Page Position: Upper, Radical: Person (rén), Page 10, Entry 01 Pronounced tu (falling tone) from "Tang Yun" and "Ji Yun," same pronunciation as "tong" (rising tone). "Shuowen Jiezi" explains it as a type of tortoise. Also pronounced zhi (falling tone) from "Guang Yun," and zhi (falling tone) from "Ji Yun," same pronunciation as "zhong" (rising tone). The meaning is the same.