Well, debatable since that was reaaaaaally ambiguous. I'll go with No, it's not solely linked to a particular expansion.
Is it a part of the user interface? (in any segment of the game, from the time you launch the patcher to all the way into gameplay to back out again)
No, but you might be able to see it in part or parts of the interface (totally giving a hint to mollify Morituus!).
Is: Seen in a colour, something you can have one, two, three or four of, something I can see with my own eyeballs, something you can see with your own eyeballs (barring vision problems), seen in text of numbers and/or letters, seen in part or parts of the user interface. Is not: A shrubbery, green in any way, directly equippable, a worn item, an ornament, something you could take down and pass around, an item, a creature, a spell effect, something a toon can see with their own eyeballs, something that you can make go away if you have a problem with it, round, a tumbleweed familiar, the aggrometer, have corners, a title, a good thing (but debatable), something with a maximum of four, old school, a torture coffin, related to Alarans, spam, connection info bound to F11, a heal parse, a really really nebulous question about it being related or linked to a specific expansion (that I actually called in a third party to ask their opinion on), AA/LAA.
