Taijitu as the Joseon royal standard. Since the 1960s, "yin-yang symbol" is most widely applied to the "He tu" symbol which combines the two interlocking spirals with two dots. In the standard form of the contemporary "yin-yang symbol", one draws on the diameter of a circle two non-overlapping circles each of which has a diameter equal to the radius of the outer circle. One keeps the line that forms an "S", and one erases or obscures the other line. The design is also described "pair of fishes nestling head to tail against each other". The Soyombo symbol of Mongolia may be
Zhou Dunyi credited in Taoism as the first philosopher to popularize the concept of the taijitu or "yin-yang symbol". Born in 1017 in Yingdao County, Daozhou prefecture, in present-day Yongzhou, southern Hunan, Zhou was originally named Zhou Dunshi. Raised by a scholar-official family, he was changed his name in 1063 to avoid a character in the personal name of the new Emperor Yingzong. His father died when he was fourteen and he was taken in by his uncle Zheng Xiang. He received his first posting in government through his uncle. Although very active in his civil service career, he never did achieve