All the movies are represented by in icon that shows an element or a character taken from the plot, the title of the movie itself, a number, that is the movie's rank in the chart, and below, some pictographs.
The stars represent the relationship between revenues and spending.
That is, "how much the earnings have exceeded the actual manufacturing cost".
For example, 1 white star stands for "x 100",
The movie "Halloween" (which has 2 white stars) in fact has earned approximately 200 times the cost.