A modern form of the triple spiral symbol

The Celtic triple spiral or triskele symbol is sometimes called the spiral of life and was found in the Newgrange site from the Bronze Age in Ireland. The triple spiral is an ancient symbol of Celtic beliefs, and was used consistently in Celtic art for 3 millennia. The Celts believed that all life moved in eternal cycles, regenerating at each point. Celts also believed that all important things came in three phases, for example: birth, death, and rebirth; or mind, body, and spirit.

The triple spiral later became the triskele used in Christian manuscripts. In neopagan religions, the triple spiral is also used to represent the triple goddess.

According to Uriel's Machine by Knight and Lomas (2003) the triple spiral may represent the nine month period of human pregnancy, since the sun takes a fourth of a year to go from the celestial equator (an equinox) to extreme north or south declination (a solstice), and vice versa. During each three-month period, the sun's path across the sky appears to form a closely-wound quasi-helical shape, which can be likened to a spiral, so that three spirals could represent nine months, providing an explanation for a link between fertility and the triple-spiral symbol.

Version with three thick single spirals.

Spiral triskelion, occasionally used as a Christian Trinitarian symbol.

One decorative version of a "wheeled" form of the triple spiral symbol, sometimes considered a solar symbol

A spiral triskelion with a hollow triangle at its center

Triple spiral visible on entrance stone at Newgrange