The Yin Yang symbol is a very historical and old symbol in ancient China. Yin means Shadow, while Yang means Light. The idea of the symbol is to show the balance between these two opposing forces. It represents the concept for stability on the earth and that you need both of these for complete the cycle. This duality can also be used to represent other natural duality forces such as: Light and Dark, Male and Female, Hot and Cold, Low and High, Good and Evil, etc. One of the biggest points of the Yin Yang in Taoist beliefs is that the concept of Light cannot be understood without Darkness and that Darkness cannot exist without light.