Tier

Tier has three common meanings in World of Warcraft.

Armor
All classes in World of Warcraft have unique armor sets designed specifically for their own usage. Armor sets obtained through raiding are designated by tier.

With Legion all tiers from before  has been deactivated.

For more information, see Armor set, and individual tier articles: Tier 1, Tier 2, Tier 3, Tier 4, Tier 5, Tier 6, Tier 7 heroes' and valorous (7.5), Tier 8 valorous and conqueror's (8.5), Tier 9 conquest and triumph (9.5), Tier 10, Tier 11, Tier 12, Tier 13,  Tier 14, Tier 15, Tier 16,  Tier 17, Tier 18,  Tier 19

Talents
Talents are arranged into tiers of 3 talents each, with higher tiers requiring higher character level.

PVP Talents
Il all PvP activities unlocks another talent grid. These talents will be unlocked individually via Honor levelling progression.