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Some people have Spades in their signature lines (Bronze/Silver/Gold)
At least one person had a diamond.
Because of the placement and similarity, it appears it's something "official"..
What gives? lol
That has to do with the gardening thread in the Credit Card threads which is monitored by tinuviel.
http://ficoforums.myfico.com/t5/Credit-Cards/Garden-Club-Meeting-February-2013/td-p/1845569