The star_(symbol) wiki mentions that it should be used for The five-pointed (★) star symbol.
However, I think the five-pointed star should be moved to a tag of it's own, and star_(symbol) should be turned into an umbrella tag for using other shapes in place of the common five-pointed star in order to represent stars, such as post #5312140, post #4753374 (notice the six-pointed or four-pointed stars), or post #5474151.
