Get a lambda. Geeks will nod approvingly and you can tell the jocks that it's from 300.

My plan is Lambda on the left shoulder, Pi on the right. Lambda for programming and right-brain, Pi for math and left-brain. I feel that they are simple, elegant, and have a lot of meaning. My only worry is that they won't age well, but I have no knowledge of tattoos.

I made a deal with myself and my wife that I will get both tattoos once I have made a living working for myself (either a successful startup exit or my consulting taking off).

I did this a couple years back -- thus far my only tattoo. It sums up a large portion of my life in one beautiful symbol. http://desmond.yfrog.com/Himg129/scaled.php?tn=0&server=...

Or people will think you like the game Half-life that little bit too much.

http:://www.lambda.org ?

How about: http://en.wikipedia.org/wiki/Garden_of_Eden_(cellular_automa...

I'd go with this one: http://www.conwaylife.com/wiki/index.php?title=Garden_of_Ede...

It is the smallest Garden of Eden, is rotationally symmetric, evolves to nothing, and looks cool.

Nice! Maybe for the next one.