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, always around (in the current game). 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, having anything to do with the player sucking at EQ or life in general, something to do with greed, the marketplace icon, the EQ thing, UCS chat channels, damage or heals in chat windows, something you can use to buy items, the hotbar thingy, related to the achievement system, anything to do with your health or mana, the countdown timer for abilities, chat windows.
Since you have said that it is "seen in part or parts of the user interface"... Is it seen in any part, tab, or potential child window of any window that can be opened/closed by clicking on a button in the Selector Window? (By Selector Window, I'm referring to the window selection bar that we had prior to the existence of the EQ button. I think it is toggled with Alt W by default.)