Zi Collection, Page Position: Upper, Radical: Roof (mián), Page 112, Entry 03 In "Guangyun" and "Jiyun," it is recorded as having the pronunciation "ping mi qie," which sounds the same as "bei." "Yupian" explains it as "a board mold." Additionally, "Jiyun" explains it as "a window." Another explanation refers to the crossbeam of a bed.