Why are the Big Dipper engraved on the sword?

To put it simply: ward off evil spirits and control the house. In ancient times, the Big Dipper symbolized the star of the emperor. In Taoism, the Big Dipper has the functions of dispelling evil spirits, warding off evil spirits, controlling the house, suppressing evil spirits, and exorcising evil spirits. There is also a saying It is called the emperor's appearance of stepping on the seven stars. In ancient times, some coffins were engraved with seven stars after they died. The meaning is nobility, and they also hope that their next generation can enjoy glory and wealth. This plays a role in Feng Shui, and that's about it. There are only so many functions that I know, I hope it helps you