Blue

Rare level items, better quality than greens but worse than purples

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BG

Battleground, an area dedicated to PvP encounters between alliance and horde

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BFD

Blackfathom Deeps, an instance in Ashenvale

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BF

Blood Furnace, a Hellfire Citadel instance in Hellfire Ramparts

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Avatar

The representation of a player's character in the world

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AV

Alterac Valley, a battleground with 40 players on each side. The main objective is to kill the opposition's general

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Arc

The Arcatraz, a Tempest Keep instance in Netherstorm

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AQ

Ahn'Qiraj, a set of level 60 raid instances in Silithus

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AoE

Area of Effect – a spell or ability that affects anything within a given space. Most often refers to damage, but can be healing, buffing, or debuffing as well.

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Alt

A alternate character, as opposed to a main character or primary character

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