I'd advise against the zeta symbol as a tattoo because many non-zoo or ever anti-zoos knows what it means now.
I know it sounds stupid but I love the idea of a zeta tattoo at the small of my back so everyone can see it when I stretch, bend over or wear a crop top. I get tingly over the thought of people looking at me and wondering if that's really what I am.
What fun is telling? ?and you are?