What does the white tiger mean?

White tiger, formerly known as White Tiger Star, is a concept of ancient astronomy, which refers to the four spirits in the sky and a group of constellations in the twenty-eight nights. The Four Spirits, also known as the Four Elephants, refers to an image composed of four stars in the sky, namely the Dragon Constellation in the East, the White Tiger Constellation in the West, the Suzaku Constellation in the South and the Xuanwu Constellation in the North.