How to write the word "Wei" in the idiom "Wei Zifang"

Emperor Tai Huang of Zhongtian, Weizi and Beiji.

Emperor Wei Zi is one of the four emperors of Taoism (there are also six emperors), and he is known as the "Emperor of Heaven, Purple and North Pole". Wei Zida, also known as Ziweiyuan, Zigong and Ziweixing, is located in the middle of the three walls and belongs to the emperor in the constellation. The palace is also called the Forbidden City, which is the origin. The function of Emperor Wei Zi is: to be in charge of the natural latitude and longitude, to command the natural phenomena such as the sun, the moon, the stars, the gods of mountains and rivers, and the four seasons, and to call for rain and serve the gods of thunder and lightning. For example, the volume "Notes on Nine Days' Ying Yuanlei Popularizing Tianzun's Imperial Books and Preserving Classics" says: "The Arctic Han Emperor mastered five thunders. "Emperor Wei Zi's birthday is April 18th. Taoism believes that Polaris is the eternal star, located in the center of the sky, with the highest status and the most noble, and is the "Lord of the stars", so it is highly respected.

In the house many years ago, there would be purple light or purple stars shining high above the central hall.