What is Yin-Yang Eight Diagrams?

The Yin-Yang Eight Diagrams, also known as Taiji Eight Diagrams, are eight basic figures used in Zhouyi, an important classic of ancient Taoism in China, and are also called Eight Diagrams, which are composed of "-"and "-"symbols. The names are: Gan, Kun, Zhen, Xun, Kan, Li, Gen and Dui, which symbolize eight natural phenomena: heaven, earth, thunder, wind, water, fire, mountains and peace. The hexagrams of Gan and Kun occupy a particularly important position in the Eight Diagrams.