math symbols not displaying

[Andrew Dabrowski]

I'm working on a simple Python program, with Tkinter, and I need to 
display the math symbols for set union and intersection, in unicode 
\N{N-ARY UNION} and \N{N-ARY INTERSECTION}. Everything was displaying 
correctly (when I ran the program) until I changed my OS distribution 
from SuSE to Ubuntu. Now those two symbols are not being displayed. I'm 
not getting any error messages, there are simply blank spaces where the 
symbols should be. Any ideas what the problem could be? I'm using Gnome 
under Ubuntu 6.06.