Taijitu (Traditional Chinese: 太極圖; Simplified Chinese: 太极图; Pinyin: tàijítú; Wade-Giles: t'ai⁴chi²t'u²; rough English translation: “diagram of supreme ultimate”) is a term which refers to a Chinese symbol for the concept of yin and yang (Taiji). It is the universal symbol of the religion known as Taoism and is also often used by non-Taoists to represent the concept of opposites existing in harmony. The taijitu consists of a rotated pattern inside a circle. One common pattern has an S-shaped line that divides the circle into two equal parts of different colors. The pattern may have one or more large dots. The classic Daoist taijitu (pictured right), for example, is black and white with a black dot upon the white background, and a white dot upon the black background.
Patterns similar to the taijitu also form part of Celtic, Etruscan, Roman and much earlier Cucuteni-Trypillian culture iconography, where they are loosely referred to as yin yang symbols by modern scholars; however no relationship between these and the Chinese symbol has been established.
The taijitu is a simple geometric figure, consisting of variations of nested circles. The classical Taoist symbol can be drawn with the help of a compass and straightedge: 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. Thus, one obtains a form which Taoist texts liken to a pair of fishes nestling head to tail against each other. This basic pattern is not a pure product of human imagination, but also occurs − of less geometrical precision − in nature (see image at the right). In the most common Daoist variant, the two differently colored halves additionally contain one dot each of opposite color.
It is additionally connected to the swastika symbol, using the S-shaped line dividing the two portions of the circle and drawing it both vertically as well as horizontally, then by changing the soft arcing lines to be more angular, results in a swastika. The bent arms of the swastika create the same sensation of rotation as the two teardrop shaped halves of the taijitu.
The term taijitu (literally "diagram of the supreme ultimate") is, in modern times, commonly used to mean the simple "divided circle" form (), but it may refer to any of several schematic diagrams that contain at least one circle with an inner pattern of symmetry representing yin and yang — for example, the one at right, which was Zhou Dunyi's (1017–1073) original form of the diagram. It was later popularized further in China by Ming period author Lai Zhide (1525–1604).
In the taijitu, the circle itself represents a whole (see wuji), while the black and white areas within it represent interacting parts or manifestations of the whole. The white area represents yang elements, and is generally depicted as rising on the left, while the dark (yin) area is shown descending on the right (though other arrangements exist, most notably the version used on the flag of South Korea). The image is designed to give the appearance of movement. Each area also contains a large dot of a differing color at its fullest point (near the zenith and nadir of the figure) to indicate how each will transform into the other.
The Taijitu symbol is an important symbol in martial arts, particularly t'ai chi ch'uan (Taijiquan), and Jeet Kune Do. In this context, it is generally used to represent the interplay between hard and soft techniques.
The Song Dynasty philosopher Zhou Dunyi (1017–1073) wrote the Taijitu shuo 太極圖說 "Explanation of the Diagram of the Supreme Ultimate", which became the cornerstone of Neo-Confucianist cosmology. His brief text synthesized aspects of Chinese Buddhism and Taoism with metaphysical discussions in the Yijing.
Non-polar (wuji) and yet Supreme Polarity (taiji)! The Supreme Polarity in activity generates yang; yet at the limit of activity it is still. In stillness it generates yin; yet at the limit of stillness it is also active. Activity and stillness alternate; each is the basis of the other. In distinguishing yin and yang, the Two Modes are thereby established. The alternation and combination of yang and yin generate water, fire, wood, metal, and earth. With these five [phases of] qi harmoniously arranged, the Four Seasons proceed through them. The Five Phases are simply yin and yang; yin and yang are simply the Supreme Polarity; the Supreme Polarity is fundamentally Non-polar. [Yet] in the generation of the Five Phases, each one has its nature.
Instead of usual Taiji translations "Supreme Ultimate" or "Supreme Pole", Adler uses "Supreme Polarity" (see Robinet 1990) because Zhu Xi describes it as the alternating principle of yin and yang, and ...
insists that taiji is not a thing (hence "Supreme Pole" will not do). Thus, for both Zhou and Zhu, taiji is the yin-yang principle of bipolarity, which is the most fundamental ordering principle, the cosmic "first principle." Wuji as "non-polar" follows from this.
In Celtic art, the motif of two interlocking commas that appear to swirl is a recurrent one which can be traced back to the late 5th century BC. With a view to the much later Chinese symbol, art historians of the La Tène culture refer anachronistically to these clinging pairs as "yin yang".
Early Celtic yin yangs are typically not treated for themselves alone, but appear as part of larger floral or animal ornament, such as revolving leaves at the bottom of a palmette or stylized tails of seahorses. In the 3rd century BC, a more geometrical style develops in which the yin yang now figures as a principal ornamental motif. It is not clear whether the Celts attributed any symbolic value to the emblem, but in those cases where it is placed prominently, such as on the upper end of a scabbard, its use seems to have been apotropaic.
Unlike the classic Taoist symbol, the Celtic yin yang whorls consistently lack the element of mutual penetration, and the two halves are not always portrayed in different colors. In keeping with the dynamic nature of Celtic decor which is characterized by a strong predilection for curvilinear lines, the circles often leave an opening, conveying the impression of the interlocked leaves swirling endlessly around their own axis. Sometimes the yin yang motif is also executed in relief.
The popularity of the design with the Celts is attested by the wide range of artifacts adorned with yin yang roundels. These include beaked flagons, helmets, vases, bowls, collars, hand-pins, cross-slabs, brooches and knife blades. While Celtic iconography was gradually replaced by Roman art on the continent, its revival in post-Roman Britain and persistence in Ireland (see Insular art) also saw the resurgence of the ancient yin yang motif; the comma-shaped whorls in a triskele layout in the famous 7th century Book of Durrow (folio 3v) are a case in point.
In Etruscan art, the yin yang motif arrives at the end of the 4th century BC, possibly due to the rising Celtic trans-alpine influence. It appears in large size on the belly of two oenochoe excavated in a Falisci tomb, showing a fusion of Etruscan floral ornament with the geometrical pattern by now typical of the Celtic yin yang.
The classical yin yang pattern appears, for the first time, in the Roman Notitia Dignitatum, an ancient collection of shield patterns of the Roman army. The shield collection which dates to ca. AD 430 has survived in three manuscript copies. These show the emblem of an infantry unit called the armigeri defensores seniores ("shield-bearers") to be graphically identical in all but color to the classic Taoist taijitu. Another Western Roman detachment, the Pseudocomitatenses Mauri Osismiaci, used an insignia with the same 'fish-like' form that had dots in one color. An infantry regiment, the Legion palatinae Thebaei, had a pattern for its shields that also appears in taijitu: three concentric circles vertically divided into two halves of opposite and alternating colors, so that, on each side, the two colors follow one another in the inverse order of the opposite half. The Roman symbols predate the taijitu by several hundred years:
As for the appearance of the iconography of the "yin-yang" in the course of time, it was recorded that in China the first representations of the yin-yang, at least the ones that have reached us, go back to the eleventh century AD, even though these two principles were spoken of in the fourth or fifth century BC. With the Notitia Dignitatum we are instead in the fourth or fifth century AD, therefore from the iconographic point of view, almost seven hundred years earlier than the date of its appearance in China.
Unicode features the taijitu 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, among other symbols used in religious texts.
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