This star symbolizes the featured content on Wikipedia.
The featured articles are what we believe to be the best articles in Wikipedia. Prior to being listed here, articles are reviewed at Wikipedia:Featured article candidates for accuracy, neutrality, completeness, and style according to our featured article criteria.
At present, there are 997 featured articles, out of a total of 6,855,533 articles on Wikipedia. That means approximately 1 in ? articles is listed here. Articles that no longer meet the criteria can be proposed for removal by being listed at Wikipedia:Featured article removal candidates.
A little bronze star (as pictured above, but smaller) to the right of an article's title on its page indicates that the article is a featured article.