Function:
① Substances necessary for promoting human growth, development and reproductive function, maintaining women's menstruation and pregnancy, and maintaining male sperm production and fertility. It comes from kidney essence of men and women, and is gradually enriched under the subtle nourishment of post-Shui Gu.
② In men, it is "Jing", which is another name for Jing. "Huangdi Neijing Tai Su": "Tian Gui, Jing Ye."
③ The nicknames of Yuan Yin and Yuan Qi. Classics and Dirty Images: "Therefore, those who are in heaven are also ... in people. They are doing it for Yuan Yin. This is also called vitality."
④ In women, it is "blood", which is synonymous with menstruation. For example, there is a saying in Women's Recipe that "Tiangui is overdue", which refers to the late menstruation. It is rarely used now.
Extended data:
Legend has it that WU GANG's wife's third son transformed it. WU GANG, also known as Wu Quan, is a native of Xihe. Sun Boling, the son of Emperor Yan, had an affair with WU GANG's wife when he left home for three years in WU GANG, and gave birth to three sons. WU GANG killed Boling in a rage, angered Emperor Yan, sent WU GANG to the moon, and ordered him to cut down the immortal tree-laurel.
The laurel tree is 500 feet high and can be cut down together. Emperor Yan used this endless labor as a punishment for WU GANG. WU GANG's wife, because of her inner guilt, called her three sons, one named Drum, one named Yan and the other named Yan, and flew to the moon together to accompany their nominal father through the long and endless cold years.
WU GANG's three sons, one named Drum, became a toad, the other named Yan, the jade rabbit and the other named Yun, and became a "nameless" treasure. Since then, arrows have been made, bells and chimes have been made of drums and drums, and the composition of music has also been formulated. So the lonely Guanghan Palace is often filled with Yue Xian.
Baidu Encyclopedia-Tiangui