Coding
Codes are representations that have meaning. For example, the inverted triangle shape for traffic signs infers caution and the hexagonal shape is reserved for stop signs. One can use numbers, letters, shapes, colors, and configurations to code visual information. Compound codes use two or more codes at the same time. Codes often are applied for convenience or some practical reason, but they should be used with care. Codes may slow processing, particularly when they are not used regularly, because a person must recall the meaning of the code. In some cases, however, codes may speed up a task.