Visual symbols like graphs, drawings, cartoons, diagrams and maps are effective teaching tools that convey information more clearly than plain text. There are many types of visual symbols that can be used including drawings, cartoons, strip drawings, diagrams, charts and maps. Diagrams include affinity diagrams, tree diagrams, fishbone diagrams and more. Charts include time charts, tree charts, flow charts, organizational charts, comparison/contrast charts, Pareto charts and Gantt charts. Graphs include pie graphs, bar graphs, pictorial graphs and line graphs. Maps show representations of the earth's surface and include physical maps, relief maps, commercial maps and political maps. Understanding the key elements of visual symbols like titles, legends