Visual symbols come in many forms such as drawings, cartoons, strip drawings, diagrams, maps, charts, and graphs. Diagrams show relationships and include affinity, tree, and fishbone diagrams. Charts include time, tree, flow, organizational, Pareto, and Gantt charts. Graphs include pie, bar, graphic organizers, and pictorial graphs. Maps represent the earth's surface and include physical, relief, political, and commercial maps. To effectively use visual symbols requires skill in creating drawings, utilizing symbolism without words, and showing relationships between parts and the whole through creative and resourceful presentation.