From the legend of the immortals: "I went west, and I saw a purple floating off in the shade, but I crossed by a green cow." Legend has it that before Lao Tzu crossed Hangu Pass, Guan Ling let Yin see the purple gas coming from the east and knew that saints would pass by. Sure enough, I came riding a green cow. This old metaphor is a symbol of good luck.
Similar words
1, Pei Zihuai wore a purple ribbon around her waist and a gold official seal in her arms. In the Han dynasty, the prime minister, Qiu, etc. Gold-plated with purple ribbons. Refers to senior officials.
Source: The language comes from Historical Records Biography of Fan Ju and Cai Ze: "I have fat teeth, galloping like a fine horse, bearing gold seals and tying purple heads. Before I became a master, I became rich by eating meat. 43 years is enough! "
2. The palace where the Emperor of Heaven lived in the myths and legends of Wei Zi in Qing Dynasty.
Source: Liezi written by Zheng Lieyu during the Warring States Period.