Got a new tattoo last week! I was going to wait, but I had to even my arms out. I have this weird thing about symmetry and it was driving me a little batty.
It says "Ib-a ankh em Ma'at" which means "my heart lives in Truth/righteousness"
The word "Ma'at" is a concept as well as a goddess, but the word can't be translated properly. Ma'at is the concept of cosmic balance, goodness, truth, compassion, etc etc. I usually just render it as a capital 't' Truth.