What do the eight characters belong to?

The eight characters belong to the fate of the five techniques of ancient metaphysics. The five techniques in the ancient metaphysics system refer to the divination of the fate of mountain doctors. Mountain refers to cultivating immortals; Medicine refers to Chinese medicine; Fate refers to numerology prediction, such as Wei Zi's fighting number and Zi Ping's eight characters; Learn from each other's strengths, such as feng shui and physiognomy; Divination refers to divination, such as six hexagrams and Daoism. The Five Techniques were born out of China's classical metaphysics and merged with philosophy, culture and mathematics.