The scales on the pole are all made of stars. The first seven stars refer to the Big Dipper, warning vendors to stand between heaven and earth and not to be greedy. The last six stars are six stars in the south bucket, warning vendors to be in the middle. In fact, in China's traditional physiognomy, these constellations all have a theory of life and death, and they hold their heads three feet high, with God's help, and they must not be greedy for petty gain.
Extended data
Even if some people think that the steelyard appeared in the Qin Dynasty, after all, it can only be said that the object is not too heavy, and the object that is too heavy needs a scale. Therefore, in the Qin Dynasty of our country, besides the steelyard, there were some large scales such as scales.
In Mozi, there are: the weight is similar, and the rest is short. Among them, it is the steelyard, and the weight is actually the weight. It can be seen that during the Spring and Autumn Period, steelyard did exist and was used by people.
There is a story about "Cao Chong called an elephant" in the Three Kingdoms. Even though it was difficult to weigh an elephant, Cao Chong suggested that the elephant should stand on the boat first, then write down the scale of the water depth, fill in the scale with stones, and finally weigh the stones. In this case, it is necessary to weigh stones, so some people think that this kind of steelyard has also appeared in the Three Kingdoms.