Which is why it would be "A 'U'", and not "An 'U'". I guess what I'm getting at is if the word sounds like it would start with a constanant, then "A" would go in front of it, if it sounds like it would start with a vowel, then "An" would go in front of it. I was always under the impression that if a word started with the letter Y, then Y would be considered a constanant and not a vowel.

...This makes much more sense in my head...