I have a wave tattoo as well, and it means the world to me because it reminds me of home. I grew up right on the ocean, and everything about being by water brings me peace, and always reminds me how small i really am in the spectrum of things.
Unalome tattoos are first spiritual symbols. In Buddhism, they ar e the visual image of reaching enlightnment. The spiral means our struggle with life, while the straight line shows that we have finally found harmony.