What is a purple star?

Purple star, also known as purple MSI, is also the Polaris, the most important star in Ursa minor, and the Big Dipper revolves around it. Purple star, also called purple MSI, is also the North Star. It dominates the starry sky in the purple wall. "Wei Zi" is the leader and representative of all the stars in The Book of Wei Zidou. According to the method of dividing the stars by the gate, all the stars are divided into three systems: Beidou, Nandou and Zhongtian, and the "Dou" of the gate means the north and south gate.