Fraktur is only ever used for the candidate set C and the dregs set D. I would also have used it for the Smith set S, but \frak{S} is famously bad. I thought it was a G for years until grad school because it used to be standard for the symmetry group on n letters. Seriously, just look at it: S.
Typography is a science and if it were better regarded perhaps mathematicians would not be in the bind they are these days :P
;3Typography is a science and if it were better regarded perhaps mathematicians would not be in the bind they are these days :P