Why would you use an icon set in your drawing?
to show conditions; to visualize data in grouped percentages, amounts, or degrees; and simply to represent data in yes-or-no format
to show percentages, ratings, progressions, scores, and amounts for comparing symbols and identifying symbol performance
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 simply show data in the form of text, or to show text plus other symbols related to data, such as currency symbols