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When you hover over it it looks like this:

http://www.reddit.com/r/TheoryOfReddit/comments/14unl6/reddi...

I guess it is a way to publicly show the reddit gold gifting. I remember there used to be posts that got a lot of attention and there would be an "edit: Wow, 3 months of reddit gold for this comment! You guys are awesome!" Now there is a badge.