The spiral is thought to be the most basic of all symbols. The spiral was one of the first symbols that was conceived in almost every early culture, and was known worldwide. Though its early meanings are somewhat sketchy, it is often though of as an primitive solar symbol.
The spiral is a very Celtic symbol, seen on several artifacts from that era, most notability the famous monuments at Newgrange. The Spiral is more of a genuine Celtic symbol than even the commonly known knot work patterns.
To day the spiral has come to represent belief in "energy healing" techniques such as Reiki. It is also thought of as a primitive labyrinth and is used in meditation.