Spirals are some of the oldest geometric shapes in ancient artwork dating back at least to the Neolithic period.
Even ancient people could recognize that the stars overhead spun around a central point every night, and today we know we reside within a spiral galaxy. Therefore, the spiral can be a symbol of the universe, our place within it, and of the great cycles that constantly advance within this universe.
Because of its connection with mother goddess the spiral is a very feminine symbol, representing not only women but also a variety of things traditionally associated with women. Besides lifecycles, fertility, and childbirth, the spiral can reference intuition and other more internal concepts associated with women.