The flag of the Republic of South Korea is called the tae-gook-gi, and it has a deep meaning. The flag was designed and made by Yung-hyo Pak in August 1882:
White background = peace and security
Red and blue circle = purity and creation
Three lines = east, sky, heaven, spring, and benevolence
Four lines = south, autumn, sun, courtesy, and separation
Five lines = north, winter, unity, moon, and wisdom
Six lines = west, summer, ground or earth, and justice
Lines altogether = eternity, brightness, and prosperity.