on a mac, press option+shift+k
so when you're in itunes and are customizing the folder names, you can do that and it'll show up as white.
also in a mac, you can open up 'character viewer' and there are tons of symbols you can choose from as well. oh and someone posted a while back, a website where you can go on your iphone and copy & paste the icon if you don't have a mac.
Copy it right from here. I had to paste into note pad but it worked great! Thanks.