According to The Extensive Rhymes (Guangyun), it is pronounced lang. According to The Collected Rhymes (Jiyun), it is also pronounced lang. The Jade Chapters (Yupian) records that the character, which is related to the term junlang, is the name of a mountain. It is the place where the sun sets on the day of the winter solstice. Furthermore, according to The Jade Chapters (Yupian) and The Extensive Rhymes (Guangyun), it is pronounced lang. According to The Collected Rhymes (Jiyun), it is also pronounced lang. The character lang describes the appearance of a mountain that is hollow and vast.