Yea some sort of 3d wearable thing. The gms get an armband with 'gm' on it - look one of them up ingame and you'll see hopefully.

But yea, while thinking very briefly the idea I had was just to do something like that but maybe with a number on it for the number of years. The higher the number the more decorated and prestigious the band could be etc. Forums have join date, ingame can have prestige bands or loyalty bands or whatever you'd want them to be called.