Taijitu is "two-part Taiji diagram". Unicode features the "yin-yang symbol" in the Miscellaneous Symbols block, at code point U+262F (YIN YANG ☯). The related "double body symbol" is included at U+0FCA (TIBETAN SYMBOL NOR BU NYIS -KHYIL ࿊), in the Tibetan block. The Soyombo symbol, that includes a taijitu, is available in Unicode as U+11A9E, 𑪞, U+11A9F, 𑪟, and U+11AA0, 𑪠. Ornamental patterns with visual similarity to the "yin-yang symbol" are found in archaeological artefacts of European prehistory; such designs are sometimes descriptively dubbed "yin yang symbols" in archaeological literature by modern scholars. The "taijitu" consists of five parts. Strictly speaking,
Yin and yang it were, at a deeper level in Nature, and were the most ultimate principles of which the ancient Chinese could conceive. But it so happens that we know a good deal more about the historical origin of the Five-Element theory than about that of the Yin and the Yang, and it will therefore be more convenient to deal with it first." He then discusses Zou Yan (鄒衍; 305 – 240 BC) who is most associated with these theories. Although Yin and Yang are not mentioned in any of the surviving documents of Zou Yan, his school was known as the