Viion I get the feeling that is what you choose as your role when entering a party or content finder.
It's basically so the content finder can match up classes to make a balanced party.
2 = (T)anks, 1 = (H)ealer, 3 = (A)ttackers, 1 = (B)uffer, 1 = (C)aster (at least in that 2.0 pic)
