The Four Symbols, or Four Guardians, are a quartet of mythological creatures in the East Asian constellations. They are the Azure Dragon of the East, the Vermilion Bird of the South, the White Tiger of the West, and the Black Turtle of the North. Each one of them represents a direction and a season, and each has its own individual characteristics and origins. Symbolically and as part of spiritual and religious belief, they have been culturally important across China and East Asia, particularly Korea.
In 1987, a tomb was found at Xishuipo in Puyang, Henan. There were some clam shells and bones forming the images of the Azure Dragon, the White Tiger, and the Big Dipper. It is believed that the tomb belongs to the Neolithic Age, dating to about 6,000 years ago. The Rongcheng Shi manuscript recovered in 1994 gives five directions rather than four and places the animals quite differently: Yu the Great gave banners to his people marking the north with a bird, the south with a snake, the east with the sun, the west with the moon, and the center with a bear.
The colours of the animals also match the colours of soil in the corresponding areas of China: the bluish-grey water-logged soils of the east, the reddish iron-rich soils of the south, the whitish saline soils of the western deserts, the black organic-rich soils of the north and the yellow soils from the central loess plateau.
These mythological creatures have also been synthesized into the five principles system. The Azure Dragon of the East represents Wood, the Vermilion Bird of the South represents Fire, the White Tiger of the West represents Metal, and the Black Turtle (or Dark Warrior) of the North represents Water. In this system, the fifth principle Earth is represented by the Yellow Dragon of the Center.
The four beasts each represent a season. The Azure Dragon of the East represents Spring, the Vermilion Bird of the South represents Summer, the White Tiger of the West represents Autumn, and the Black Turtle of the North represents Winter. (Source: Wikipedia)