Your username must be unique. That is to say no other users at Trophy Room can share the same username as you. If you attempt to sign-up using a username that is already taken, you will be prompted to try again. Your username must be at least five characters long, comprised of letters, numbers, or spaces. Your username cannot contain special characters (e.g., #$!@%^) or punctuation. Here are some examples of user names that are acceptable: Master Hunter, BillyBoy, 0nF1sh. Here are some examples of usernames that aren't acceptable: joe, $amIam.