A difficulty of creature or NPC. Elite mobs have higher hitpoints, damage, and defense and also have armor.
(Note: Most of the mobs that are gold or silver chevron outside of dungeons have a higher chance of being soloed if you're a highly geared level 90)
|Gold Chevron||A boss and they usually require several players to take down.|
|White Chevron||Average elite mob and require more then 1 player to take down.|