What is the significance of conventional signs and symbols in topographical survey maps? Explain with the help of examples.

The conventional signs and symbols help in giving maximum information about a place or area. They allow topographical maps to convey a lot of information in a compact and easy-to-understand format. They are universally accepted. The use of conventional signs and symbols help us to quickly get an idea of the layout and characteristics of an area just by looking at a topographical map.
For example, permanent settlements are shown by red squares, hospitals are shown by plus sign of red colour, aerodrome , helipad, post office, police station, etc. are shown by their own unique symbols.