“Taegeuk is a symbol representing the principles of the cosmos creation and the norms of human life. The circumference of the Taegeuk mark symbolizes infinity and the two parts, red and blue, inside the circle symbolize yin(negative) and yang(positive), which look like rotating all the time.
Therefore, Taegeuk is the light which is the unified core of the cosmos and human life and its boundlessness signifies energy and the source of life. The yin and yang represents the development of the cosmos and human life and the oneness of symmetrical halves, such as negative and positive, hardness and softness, and materials and anti-materials.
The eight bar-signs (called kwae) outside the circle are so arranged to go along with the Taegeuk in an orderly system. One bar means the yang and two bars the yin, both representing the creation of harmonization with the basic principles of all cosmos phenomena. The Taegeuk, infinity and yin-yang are the three elements constituting the philosophical trinity as mentioned in the Samil Sinko, the Scripture of Korean race.”
– from Kukkiwon’s web site