Duo is an ancient musical instrument, a big bell, shaped like a cymbal and a cymbal with a tongue. It was used to announce political and religious laws in ancient times, and it is also an ancient musical instrument. Popular in China from the Spring and Autumn Period to the Han Dynasty: Muduo. Bell Duo. Duo dance. Ancient copper percussion instrument. Mostly used in the military. Its shape is slightly closer to the Yong bell, but smaller than the bell. The handle is short and square. There may or may not be a tongue in the body cavity. Those who have a tongue can shake it to make sounds. There are two types of tongues: copper and wooden. The one with the bronze tongue is called the golden bell, and the one with the wooden tongue is called the wooden bell. "Zuo Zhuan·Xiang Gong's Fourteenth Year": "Therefore, "Xia Shu" says: 'Qiu people use wooden poles to block the road'". Note: "Qiuren is an official who issues orders. Muduo has a wooden tongue and a golden bell."
The fable is that a boy who can be alert is a great weapon. The word "Duo" is considered a good word, but it depends on whether the child's birthday matches the word