Why would you use an icon set in your drawing?
to fill shapes with color according to their data, such as identifying all shapes of a color as "on" and different colored shapes as "off"
to show percentages, ratings, progressions, scores, and amounts for comparing symbols and identifying symbol performance
to show conditions; to visualize data in grouped percentages, amounts, or degrees; and simply to represent data in yes-or-no format
to simply show data in the form of text, or to show text plus other symbols related to data, such as currency symbols