THEman,
this will make just too much sense when you actually see it written:

a transformer that changes a signal transmission method from balanced to unbalanced, i.e. CAT5 to RG-6, will have two ends:
bal = balanced end
un = unbalanced end

put the two syllables together, you get balun, which you logically spelled balland.

these are usually non-directional, so you can use the same balun to go from unbalanced to balanced, but it is still called a balun. I guess "unbal" might be confused as an abbreviation for unbalanced.