I tried to find a yin yang vector today, but disliked the result. So I've drawn a yin yang vector myself and share for everyone. Use this yin yang vector personally or commercially - just check the license! :)
Yin and Yang vector graphics symbolizing interconnected contrary forces or polar opposites. Originating from Asian philosophy, Chinese science and medicine, Yin and Yang are symbol for natural dualities as female and male, light and dark, cold and hot, water and fire, low and high.
A Yin-Yang symbol transformed into Heaven and Earth, with the Chinese characters for each. Because Heaven is Yang, and Earth is Yin. Hope you enjoy it.