Yin yang

Passive and active principles, respectively, of the universe, or the female, negative force and the male, positive force, always contrasting but complimentary. Yang and yin are expressed in heaven and earth, man and woman, father and son, shine and rain, hardness and softness, good and evil, white and black, upper and lower, great and small, odd .....
Found on http://www.ditext.com/runes/y.html

Yin yang

[disambiguation] Yin and yang or Taiji in Chinese philosophy, often shortened to `yin-yang` or `yin yang`, are concepts used to describe how apparently opposite or contrary forces are actually complementary. Yin and yang symbol, known as Taijitu, refers to a Chinese symbol for the concept of yin and yang (Taiji) Yin yang may also refer to: ...
Found on http://en.wikipedia.org/wiki/Yin_yang_(disambiguation)
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