Pronounced xi (rising tone) - Tang Yun (Tangyun) Pronounced xu (rising tone) - Jiyun (Jiyun) Explained as an ancient pottery vessel - Shuowen Jiezi (Shuowen Jiezi) The character for "xi" in "yu xi" originates from this character - Liushu Zhenge (Liushu Zhenge) The character for "xi" is sometimes written with a component derived from "qiu," which is incorrect - Zhengzitong (Zhengzitong)