The blue envelope can't mean that I've read all the posts in a thread, because I've never even been to the sports forums, but the threads there show me blue sealed envelopes.
Also, threads that I remember looking at ALSO show me blue envelopes.
And the yellow envelope with stuff sticking out is being displayed on posts I've never read. (Maybe that symbol just means "recent posts" regardless of whether I've ever read it or not.)
The only one that makes sense to me are the ones with white arrows- those mean I've posted. Besides those, I still don't get it...
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