We as humans use symbolic terms to understand things we couldn’t necessarily comprehend without a representation through another form. There are three types of signs we use. One is an icon which is a resemblance, another is an index which is a casual connection we may make, and the last is a symbol which is a convention. We have to give symbols meaning and teach others and our society what they mean before they will work to communicate.
Icon: we recognize this as obama-resembles him
Index: weather icons mean types of weather to us (this may be more of an icon)
Symbol: red cross-symbolizes safety, help, first aid, etc.
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