Question

what is a symbol? what information does it convey?

Answer 1

All communication (and data processing) is achieved through the use of symbols. Symbols take the form of words, sounds, gestures, ideas or visual images and are used to convey other ideas and beliefs. For example, a red octagon may be a symbol for "STOP". On a map, a blue line might represent a river.

Answer 2

hey!
here is your answer
A symbol is a mark or a character as a conventional representation of an object , function or process .
It conveys the information of a certain place or a destination
for example - in a topo sheet symbols such as PO, PS represent post office and police station

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