Those are all expert classes, only available online. Weapon selection per type for online characters are way more restricted (You can use wands as a hunter offline, but online, only forces can)
You can find more info on those expert classes you can check here: http://www.pso-world.com/viewtopic.p...7&forum=22&207
Oh, and in any case you are still wondering what those weapon icons mean, they show you up to what type of rank you can use of a weapon. Online mode, the best weapons you can use are B rank weapons, so if you want to use A and S rank weapons, you will HAVE to change to one of the expert classes.