In terms of astrology, mysticism and myth the spiral translates into meanings of spirituality and rebirth. In terms of spirituality, the spiral symbol represents the path leading from outer consciousness (materialism, external awareness, ego, outward perception) to the inner soul (enlightenment, unseen essence, nirvana, cosmic awareness).
In terms of rebirth or growth, the spiral symbol represents the consciousness of nature beginning from the core or center and thus expanding outwardly. This is the way of all things, as recognized by most mystics.
The spiral has found its way into the art of almost all cultures, from ancient primitive rock carvings on all continents to today's corporate logos. They show up in Celtic art, native American petroglyphs, Nazca earthworks, Arabic architecture, Japanese rock gardens, Hindu spiritual texts, Australian aboriginal paintings and African art. Surprisingly, no religious or political group has claimed exclusive rights to the spiral. It remains non-sectarian, or maybe pan-sectarian. The spiral belongs to everyone and excludes no one.
Some consider the spiral a symbol of the spiritual journey. It is also considered to represent the evolutionary process of learning and growing. It seems that life doesn't proceed in a straight line. The path of life more closely resemble a spiral. We seem to pass the same point over and over again but from a different perspective each time. To walk and then stand in the center of a spiral or labyrinth has been a psycho spiritual exercise for centering the consciousness.