The list and gallery views of search results both display several doughnut charts. This is one about entities, for example:
These charts help to visually indicate the amount of search results to which a particular value applies. One can also hover their mouse over a slice of the chart to get a numerical count value instead of a percentage. The "slices" of these charts are also clickable, allowing for further filtering of the search results by the selected "slice" of the doughnut.
What really sets these charts apart is that once a slice is clicked and the results are filtered, the charts re-render themselves to apply to the now further refined result set, allowing for a drill-down type of filter experience.