Zi Collection, Upper Volume Radical: Mouth (kǒu) Page 10, Entry 02 Pronounced kāng — "Book of Rhymes" (Jiyun) uses qiū and gāng to pronounce this character. Pronounced kōng — "Classified Readings" (Leipian) explains this as the empty space within a house. It refers to an empty house. "Jade Glossary" (Yupian) uses kǔ and láng to pronounce this character. It means empty.