Well, these are Greek organizations. And they are under the letter A. This letter is part of the Phoenician alphabet, an alphabet... that we do not share with the Greeks!
We might have to call it alpha. And by organization, we probably mean a fraternity. Never join a fraternity. You are young now, but you want to concentrate on school. You don't want to drink beer and be loud and SUPER annoying. So just click here to download. These are emoticons for MSN Messenger.