what is the yin and yang symbol called
Taijitu Ming period author Lai Zhide (1525–1604) simplified the taijitu to a design of two interlocking spirals. In the Ming era, the combination of the two interlocking spirals of the taijitu with two black-and-white dots superimposed on them became identified with the He tu or "Yellow River diagram" (河圖). This version was reported in Western literature of the late 19th century as the "Great Monad",[2] and has been widely popularised in Western popular culture as the "yin-yang symbol" since the 1960s.[3] The contemporary Chinese term for the modern symbol is 太极兩儀图 "two-part Taiji diagram".