SYMBOL OF YIN - YANG DUALITY.......The symbol of Yin and Yang, tú Taiji ( often surrounded by eight trigrams ) is well known in the Western world since the late twentieth century. The yin represents among other things, the black (or often blue ) , female , moon, dark , cold, negative, etc. . Yang, meanwhile, is among other white ( or often red ) , male , sun, light, warmth, positive , etc. . This duality is also associated with many other complementary oppositions.