Xu Collection, Upper Volume Radical: Metal (jīn) Kangxi Strokes: 18 Page 1317, Entry 26 Pronounced wu. In the Jade Manual (Yupian), the term refers to a small cauldron. In the Extensive Rhymes (Guangyun), it refers to a warming vessel. In the Broad Refinement (Boya), it is also known as a trowel. In the History of Jin (Jinshu), Biography of Du Yu: Cauldrons, jars, scoops, trays, and warming vessels are all items of urgent necessity in the lives of the common people.