It's a throwback to the old Content Contributor scheme.
There were 3 levels, Bronzone, Silver & Gold.
You received them based on your flag to post to star ratio...
edit on 1/3/2012 by tothetenthpower because: (no reason given)
BRONZE: The first of our elite levels also triggers the code that removes ads from the discussion board*, the indicator requires at least: 300 posts, 300 stars, and 300 flags.
BRONZE: (exception) Members with more than 2,000 posts, but less than the other levels for bronze receive the "BRONZE" tag, but still see ads.
SILVER: The second of our elite levels who see no ads on the board, the indicator requires at least: 400 posts, 500 stars, and 600 flags.
GOLD: The highest of our elite levels who see no ads on the board, the indicator requires at least: 500 posts, 750 stars, and 1,000 flags.
WATS is basically a calculation combining stars, flags, applause etc.. Karma is for posting..
Those 50 members who have achieved the "Way Above Top Secret" status are now indicated as "GOLD CONTRIBUTORS" in their posts (which will soon also show for non-logged-in guests).(Source)
Members in the top-100 rankings, just below the "Way Above Top Secret" group, have a "SILVER CONTRIBUTOR" indication.