Normal mode refers to a dungeon difficulty ( & ) and raid size () setting. This setting is accessed from the party or raid leader's portrait menu; currently the only other difficulty setting is Heroic mode available with ^[1] and continued in .

Patch 3.2.0 did away with this setting, other than showing up in achievements, in favor of the following:

Dungeon difficulty:

5-player mode for the Normal mode instances.

Raid difficulty:

10-player mode for the Normal mode (10-man raid).

25-player mode for the Normal mode (25-man raid).

Patch changes

Patch 3.2.0 (04-Aug-2009): Changed the setting to 5 Player under the interface setting Dungeon difficulty. 
Patch 3.2.0 (04-Aug-2009): Changed the setting to 10 Player and 25 Player under the interface setting Raid difficulty. 

See also

References