5-player mode refers to the former dungeon difficulty setting (normal mode) for instances. This setting is accessed from the party leader's portrait menu; currently the only other difficulty setting is 5-player heroic mode. Patch 3.2.0 did away with the old reference, other than showing up in achievements.

See alsoEdit

Hard mode Dungeon difficulty: Normal mode (deprecated in Patch 3.2.0). Heroic mode (deprecated in Patch 3.2.0). 5-player mode 5-player Heroic mode

Raid difficulty: Normal mode (deprecated in Patch 3.2.0). Heroic mode (deprecated in Patch 3.2.0). 10-player mode 10-player Heroic mode 25-player mode 25-player Heroic mode