The Korean flag (태극기) is called "Taegeukgi" in Korean. Its design symbolizes the principles of the yin and yang in Oriental philosophy. The circle in the center of the Korean flag is divided into two equal parts. The upper red section represents the proactive cosmic forces of the yang. Conversely, the lower blue section represents the responsive cosmic forces of the yin. The two forces together embody the concepts of continual movement, balance and harmony that characterize the sphere of infinity. The circle is surrounded by four trigrams, one in each corner.