My sisters and I got the exact same thing, on the inside of our left wrists. We put our first 2 initials around it. It is a Celtic symbol. Represents the drawing of the three powers of maiden, mother and crone. It is a sign of female power and especially power through transition and growth. The center of this symbol represents the "hub" signifying unity of the three powers. I thought it was appropriate that there was 3 of us.
My initials are right side up and easy to read. To the left is J.L. and upside down is M.R.