I have 5, but 4 of them are pairs of 2 that match
honestly to each his own....I got mine because they mean something to me and only me. When people ask me about them, I don't tell them what they mean.
But everyone gets there's for their own reasons. Some might be personal reasons, some for artistic or symbolic value, and some because they want to look cool.
but if you do decide on getting a tattoo, I'd recommend thinking it over for at least a year....they are a pretty big commitment....well depending on where and how big they are.