I believe it's Tibetan, written in a particular cursive (dbu med "headless") style, and says "om mani padme hum". Compare the second Tibetan line here:
I'm hoping one of my colleagues will have an answer. I am stumped. My best guess is that It could be a Middle Eastern script or an Indic one (i.e. South Asian or Southeast Asian). I have a suspicion that it is using vowel marks... but it's not a guarantee.
One place to look at different scripts is Omniglot - http://www.omniglot.com However, this tattoo may be a very calligraphic style.
I do have to add that non-Western script tattoos are notorious for being inaccurate. There are blogs devoted to mistranslated tattoos.
If this is an interest in getting a tattoo, I would recommend looking at information about non-Western calligraphic styles and seeing what designs are available. The translations are likely to be more accurate.
Ideally, you would want to check with a native speaker also, or at least Wikipedia.
Sincerely hope this helps.
Elizabeth J Pyatt
Well, I tried various ways of clicking on the URL, and they all came back with 'Page not found'. Either Dr. Pyatt had better luck than I did, or the site does not accept such consultations from 'furriners'.
James L. Fidelholtz
Graduate Program in Language Sciences
Instituto de Ciencias Sociales y Humanidades
Benem'erita Universidad Aut'onoma de Puebla, M'EXICO