Justice Points was the currency to buy items as a reward for participating in normal and Heroic dungeons(up to level 60), "The Burning Crusade" Normal and Heroic Dungeons (up to level 70), Wrath of the Lich King normal and heroic dungeons and raids (up to level 80), Cataclysm dungeons on normal and heroic mode (up to level 85), and Mists of Pandaria dungeons up to level 86-87, Justice Points replaced and --(NOTE: this was the Old World currency, now also replaced with Justice Points) Cataclysm based raid content will reward Valor points instead,