Zi Collection, Upper Volume Radical: Cloud (yún) Page 117, Entry 03 In the "Jiyun" (集韵), it is the same as the character "xiāo". The "Shuowen Jiezi" (说文解字) explains it as granular rain and snow called "xiāo". Sometimes the character form is written as "xiāo" (䨭) derived from "yún" (雲).