Secret Smiles and Tattoos

I am not really a person one would expect to have a tattoo. But, if I did have one, I think I would like the wave symbol above my outer right ankle or hidden above my right hip joint. Of course this symbol has great meaning for me and would remind me of several concepts I never want to forget. I am sure of that. It is not, however, likely to happen since I am something of a body image purist, not to mention commitment phobic. I also don't care for pain and irrevocable decisions. Still... it is a fun creative exercise to contemplate what lies at the seat of the soul and imagine a visual symbol to physically carry like a nudge, reminder or a secret smile. What image would represent your secret smile?