If you have firefox and the firebug add on, when one of your buddies is on with firebug enabled, right click on the + and select inspect element.
I dove through a search in the templates and phrases and came up pretty much empty handed. In the templates the coders used +'s to do formulas so a search is pretty useless. In the phrases they used them to seperate words in a phrase.
So firebug looks like it's going to be your best bet.
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