Not sure BB maybe JB can help with that one if not I'll go to another help web site and ask. Thanks for the question. If I can help anyone in any way I will............
That indicator means you have a unique MSN nickname BB. Without one you can't do certain things in MSN groups, such as changing your profile, or at least that's the way it was the last time I checked.
That's because we don't have unique IDs BB. Some of us here are old timers who created our MSN nicknames before MSN decided to force unique identities on everyone who wants to create or change a nickname.