Yu Pian states this is the ancient form of the character for kiss (wen). Detailed annotations are provided in the section on characters with four strokes. Furthermore, Jiyun (Collected Rhymes) states it is pronounced hun. The term hun-hun refers to things that are invisible to the eye. Exemplar of Sayings (Fayan) by Yangzi states: In recording the vague and obscure affairs of ancient times and spreading the complex and difficult-to-understand situations from thousands of miles away, nothing is superior to books. Zi Collection, Page Position: Lower Radical: Mouth (kǒu) Page 185, Entry 05