1. Three-legged tripod is a round-bellied tripod, which is used to worship heaven.
2. The four-legged tripod is a square tripod, which is used as a place of sacrifice.
Extended data
Ding's historical origin
Ding is a representative figure in the bronze culture period of China. In ancient times, the tripod was regarded as a heavy weapon for the founding of the country and a symbol of state and power. Up to now, people in China still have a sense of tripod worship, and the word tripod has been endowed with extended meanings, such as keeping promises, becoming famous, reaching its peak, doing its best to help, and so on.
There is an allusion to "winning the championship" in history, which comes from "Three Years of Zuo Zhuan Gong Xuan", to the effect that Chu Zhuangwang came to Luoyang to crusade against foreign enemies and inspect the army on the site of the Emperor of Zhou. King Ding of Zhou sent Doctor Wang to comfort him and took the opportunity to ask about the size. Wang Yue: The government is virtuous, the tripod is small and heavy, the monarch has no way, and the tripod is big and light. The Zhou Dynasty made a tripod for the Central Plains, and its power was a godsend. The weight of the tripod is not appropriate. Chu Zhuangwang won the championship, which means replacing the Zhou Dynasty. The result was severely reprimanded by the king's angel. Later, the plot to usurp the throne was called "winning the championship."
References:
Baidu Encyclopedia-Ding