Xu Collection, Upper Volume Radical: Metal (jīn) 鏂 Kangxi strokes: 19 Page 1319, Entry 02 According to the Broad Rhymes (Guangyun) and Collected Rhymes (Jiyun), it is pronounced ou. According to the Jade Chapters (Yupian), it is recorded as feiou. The Collected Rhymes explains that a door knocker is called ouhou. According to the Extensive Refinements (Boya), ya'xia is called ouhou. Furthermore, according to the Collected Rhymes, it is pronounced kou. It means to gouge or scoop out. Originally written as kou.