A ringer used by ancient patrols or yamen to collect and disperse people's knocks. Made of bamboo or hollowed out wood. The second chapter of "Water Margin": "In the front and back of Zhuang, Zhuangdong and Zhuangxi, three or four hundred Shijiazhuang households heard the sound of bangs, all dragged guns and sticks, gathered three or four hundred people, and all went to Shijiazhuang ."

The sixth and second episode of "The Current Situation of the Strange Witness in Twenty Years": "The foreign trumpet outside is blowing loudly, and the footsteps of people come and go. How can I fall asleep." Ba Jin's "Sanding" 1: "The clapper of the second watch really sounded, and the crisp wood sound answered each other in this quiet night with the double barking of the dog."