Wu Collection, Lower Volume Radical: Cave (xué) 穻 Kangxi Stroke Count: 8 Page 863, Entry 03 According to the Collection of Rhymes (Jiyun), pronounced yu. The sound is the same as the word for to wind around. It refers to a window. According to the Supplement to the Collection of Characters (Zihuibu), it is the ancient form of the word for universe or eaves (yu). It is found in the records of Kong Dan from the Han Dynasty.