It is "qsort.m" which provides the context for understanding the icon below it. However, the icon isn't more representative of a quick sort than a bucket sort or a bubble sort. It's simply an arbitrary mapping of a textual token (qsort) to a graphic token (example of arbitrariness is that lighter colors on top maps to lowest values to the left).

The arbitrariness of the mapping between text tokens and graphic tokens quickly increases beyond convention the ability to establish a convention (example: "Number of cheeseburgers shipped from Peoria to Toledo last month."