Is Sal

 is a Black Hole badge. To earn it, user has to be Salman Khan - the founder of Khan Academy. Obviously, it is impossible for any member (except Sal Khan) to acquire the badge. As far as we know, Sal apparently receives an infinite number of energy points as the owner of Is Sal. It is not possible for user to receive this badge by simply changing user's username and their avatar to match Sal's.