Thank you both for the replies, I didn't realize that you can change the font in this way. Still, it might be more convenient in some cases to have special characters as strings as it might get tedious to dynamically change the font of many indicators. According to this:
http://digital.ni.com/public.nsf/allkb/77C8F61D36F5A23086256634005ACB38
the type cast vi is supposed to interpret a U8 integer as an ASCII character. If I understood correctly, wiring a 234 U8 integer to type cast should produce an ASCII character corresponding to that code (Ω). However, in my system I get ê which is 234 in many unicode scripts. I'll have to take a look at the unicode topics now. This is slightly irritating because I can produce all of the special characters I need, except for Ω!