I have three. I waited until I was in my thirties to get my first one, which is a yellow rose rising above a purple heart with the word 'Mom' on it to honor her fight with cancer and how brave she was. It's on my left ankle. The second one I got was after she died, and it reads, 'In Memory of' with 'Mom' on a ribbon over a cross. The third one is on my left forearm and is a dragonfly.
I have to admit I sort of regret the dragonfly. At the time I got it I was collecting things with dragonflies on them. I no longer collect them, and have dispersed my collection, but I have the dragonfly forever and while it's pretty, it means nothing to me. Live and learn, and let that be a lesson for anybody out there who's contemplating a tattoo. Never get anything that you're not prepared to live with for the rest of your life.
My sister and I always talk about getting matching tattoos. We haven't yet, but it's coming.