Blue
From WoWWiki
The color blue is used in World of Warcraft for rare items. Rare blue items are between green and purple in quality. Blue may also refer to a color of a specific gem slot on a piece of armor.
Blue is also slang for Blizzard or a Blizzard representative (especially on the forums).
Blue in another player's name means they are friendly and have PvP off.
See also
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