Triple Spiral (Triskelion)

The Celtic triple spiral, or triskelion, is a symbol of the Triple goddess (maiden, mother, crone) also, waxing waning and full moon.
The triskelion is believed to be an ancient symbol of pre-Celtic and Celtic beliefs.
It is typically considered a Celtic design, but also has been found in some Buddhist writings. It appears in a variety of places as a three-faceted spiral.
For modern Pagans and Wiccans, it is sometimes adopted to represent the three Celtic realms of earth, sea and sky.