Yin and Yang
Very popular symbol in chinese philosophy and culture.
Literally meaning "shadow and light". It is used to describe how polar opposites or seemingly contrary forces are interconnected and interdependent in the natural world.
Everything has both yin and yang aspects as light could not be understood if darkness didn't exist, and shadow cannot exist without light.
The concept of yin and yang is often symbolized by various forms of the Taijitu symbol. This symbol is part of the Taoism.
In this app you will find a lot of creations of this symbol, many designers have spent time on drawing this symbol in thousands variations.