I'm going to mention the unmentionable, but those symbols look like some of that code crap that used to show up on GNFR.com.
it sure fucking does.... i wish i could figure that shit out..
It's the answer to riddle # 7 "what's big and tall and sways in stride ?"
edit to say I am kidding ......I don't even own this album so I had no idea what this was until I read this thread.
I agree with whoever said it was put on there by the marketing company.