In the Five Elements Theory, Yin Shi belongs to wood, Shi Si to fire, Shenshi to gold and Shihai to water. These four earthly branches correspond to the different attributes of the five elements, which can be used to analyze people's fortune and ways of doing things in different periods, and at the same time, they can also predict and judge good and bad things, which are deeply believed and sought after by many people.
In addition to China's cultural traditions, other East Asian countries, such as Japan, South Korea and Viet Nam, have similar ways of use. Besides, in South Asian cultures such as Indian and Nepalese, Shen Yinhai is also used as a symbol of the zodiac and heavenly stems, which is different from China's cultural tradition. Different cultural customs have different connotations and meanings in different regions, but they all reflect people's cognition and thinking about time and the order of the universe.