Ok, some of you have been asking what does the Xbox live party chat symbols mean. Well the symbols indicate whether or not they are playing a game (controller), and if that game is joinable (circular arrow).
Controller - Playing a Game/At the Dashboard
Circular Arrow - In a joinable session.
Formerly Known as "Umbreawesome"
R.I.P. Mitt Romney (10/9/1940 - 12/8/1980)
Drummer of Avenged Sevenfold.
There is also one that has multiple little avatars that means that you are able to join the game.