Originally Posted by
aggixx
It's actually "(OQ)" and like DrWinkenstein said it's caused by the addon oQueue.
Basically what it's for, is for most channels like whispers, guild, etc, there is a corresponding hidden channel that addons can use to send messages to other people in the channel. However, there is no such channel for RealID, so oQueue works around this by putting that indicator into the users status. This way the addon knows anyone on the person's friends list with "(OQ)" at the start of the message can be sent addon data and it will be filtered out by the addon on their end.