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
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