. To provide future direction
. As a part of my religion
. To claim my body, once and for all, as my own.
It'll be a modified Celtic cross, with the crosspieces consisting of ovals. It'll go on the back of my right leg, just below the knee, on the meat of my calf. That way it's easy to conceal when I choose, as well as easy to show.
I want a Celtic cross because I have a nice symbology to go with it, and I find the shape aesthetic. The four crossbars will represent parts of soulmyself, and the circle will represent the way I draw those pieces together to form a (at least partially) coherent whole.
Of course, I still don't expect my parents to understand my reasoning, but hey. They're my parents.