http://www.millenniumdesktop.co.uk/ouroboros.htm The snake biting its own tail image used in the opening title sequence of Millennium is called an Ouroboros. In the series it is the symbol of the Millennium Group. In mythology, the Ouroboros is any image of a snake, worm, serpent, or dragon biting its own tail. It was first seen as early as 1600 years BC in Egypt. The Greeks called it the Ouroboros, which means "Tail Eater." Generally taking on a circular form, the symbol is representative of many broad concepts. Time, life continuity, completion, the repetition of history, the self-sufficiency of nature and the rebirth of the earth can all be seen within the circular boundaries of the Ouroboros. Societies from throughout history have shaped the Ouroboros to fit their own beliefs and purposes. The image has been seen in Japan, India, utilized in Greek alchemic texts, European woodcuts, Native American Indian tribes and even by the Aztecs. It has, at times, been directly associated to such varying symbols as the Roman god Janus, the Chinese Ying Yang, and the Biblical serpent of the garden of Eden. http://abacus.best.vwh.net/oro/ouroboros2.html This symbol appears principally among the Gnostics and is depicted as a dragon, snake or serpent biting its own tail. In the broadest sense, it is symbolic of time and the continuity of life. It sometimes bears the caption Hen to pan - 'The One, the All', as in the Codex Marcianus, for instance, of the 2nd century A.D. It has also been explained as the union between the chthonian principle as represented by the serpent and the celestial principal as signified by the bird (a synthesis which can also be applied to the dragon). Ruland contends this proves that it is a variant of the symbol for Mercury - the duplex god. In some versions of the Ouroboros, the body is half light and half dark, alluding in this way to the successive counterbalancing of opposing principls as illustrated in the Chinese Yin-Yang symbol for instance. Evola asserts that it represents the dissoluotion of the body, or the universal serpent which (to quote the Gnostic saying) 'passes through all things'. Poison, the viper and the universal solvent are all symbols of the undifferentiated-of the 'unchanging law' which moves through all things, linking them by a common bond. Both the dragon and the bull are symbolic antagonists of the solar hero. The Ouroboros biting its own tail is symbolic of self-fecundation, or the primitive idea of a self-sufficient Nature - a Nature, that is which, à la Nietzsche, continually returns, within a cyclic pattern, to its own beginning. There is a Venetian manuscript on alchemy which depicts the Ouroboros with its body half-black (symbolizing earth and night) and half-white (denoting heaven and light).