Huiyin Point 會陰
The Huiyin 會陰 point is the foundation, ground or root of the Dantian丹田. Huiyin point is a very important point for the Dantian and the body. “Hui會” means Gathering”. “Yin陰” means Yin, as in Yin and Yang. In Chinese culture and philosophy, Yin and Yang play a very important role. Yin is like the night, water, feminine, etc. Yang is like the day, fire, masculine, etc. So Huiyin means gathering the Yin together, and this is very obvious because of where the Huiyin point is located. It is between the anus and the genitals and this this is a very vulnerable area and so the Huiyin point is very Yin. Conversely on the top of the head, at its centre is the Baihui百會point, which is very Yang. We can see the Baihui and it reaches out to the sky. The Huiyin point is hidden and faces the Earth. Its energy is withdrawing.
These two points, the Huiyin and the Baihui form a straight line to create a strong channel, and this is the Chong Mai衝 脈 or Chong Channel (in Qigong the Chong Mai is seen differently to acupuncture point theory). The Huiyin point should be flexible and should be able to move easily, then the Dantian will be strong and there will have fewer internal diseases.