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That's a ""throwback"" to the many years I've spent on Usenet.  The  is one of several abbreviations that are used there.  It signifies a grin.  For example, there is the regular grin:    and then there is the wide grin:  <<>>.  It's a quick way to show someone that you are kidding with them, or that your words are ""tongue in cheek"".  The  predates even smilies.  Best of everything to you and yours! –  ( CLIMAX )  "