What is the meaning of Tai Chi?

The so-called Tai Chi is to explain the process of the universe from Wuji to Tai Chi, and even the transformation of all things. Among them, Tai Chi refers to the state before heaven and earth were opened and chaos was not divided into yin and yang. A line from the Book of Changes: "That's why the Yi has Tai Chi, which gives birth to two rituals." The two instruments are the Yin and Yang instruments of Tai Chi. The earliest known literature on "Tai Chi" so far comes from "Zhuangzi". The theory of Tai Chi Schema is the fruit of the "Tai Chi" thought of Zhuangzi in Confucianism and Taoism.

Extended information:

There are many kinds of Tai Chi diagrams, such as Zhou Dunyi Tai Chi diagram, Xiantian Tai Chi diagram (originally known as "Heaven, Earth and Nature Picture", commonly known as "Yin Yang Fish Picture"), Ancient Tai Chi diagram Bagua diagram (Xiantian Taichi diagram with Bagua symbols around it), Laizhide Taichi diagram and Duanmu Guohu Taichi diagram of Qing Dynasty. After being passed down to this day, among the diagrams, only the Innate Tai Chi Diagram and the Ancient Tai Chi Bagua Diagram are well known. Therefore, what modern people call "Tai Chi Diagram" is the "Yin Yang Fish Diagram" or "The Diagram of Heaven, Earth and Nature". The "Tai Chi Bagua Diagram" is the paradigm of the ancient Tai Chi Bagua Diagram, and the "Tai Chi Bagua Diagram" is often simply called "Tai Chi Bagua Diagram".

Reference: Baidu Encyclopedia-Tai Chi