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Plus simply means it is a new topic.The flame with the webmaster head means that numerous people have posted on it making it a "hot topic."This information can be found in the Bungie.net help section for future reference.[Edited on 02.08.2008 12:33 PM PST]
Posted by: CheeseofdeathLike a plus or a flameI would suggest reviewing section 9.2 here, titled Topic Icons. This will hopefully answer your inquiry.