It is an average of how the user(s) have rated that thread. It is not really used much so I would put little credibility to it. SOme of the best threads may have no stars at all. WHile Fight Club may have 5 stars.Thanks CD. Go tpo the list of threads and under the rating column you will see the various icons including up to four or five stars and some other icons. Nowhere can I find an explanation of those icons.