Inscription is a new profession which was introduced in Wrath of the Lich King with which players can create Glyphs which are enhancements to an individual's spells or abilities, Scribes can also make Scrolls and items you can equip in your off-hand.
WotLK Classic Profession Bonuses
As we are getting closer and closer to the launch of WotLK Classic, some of you might be wondering about changing professions, but you don't know yet which one to choose. With the release of Wrath of the Lich king, every profession will have a few profession only bonuses that can only be equipped or used by yourself.
The + number after the items or enchants shows the bonus you get from your profession over the normal enchant/item that everyone can get.
Below you can find the list of every new profession combat bonus.
WoW Professions Update from WoTLK Beta
Below you can find the latest Profession changes in the beta.