In order to get a great deal of information into a small space that can be clearly interpreted.
A 2d house
A picture in a map key that represents an object is a symbol. Maps use keys to explain the meaning of each symbol on the map.
most map I have seen had the book symbol
To represent oil-producing states on a map, you could use a specific symbol such as an oil rig icon. This symbol is commonly used to denote locations where oil is extracted or produced. Using a consistent and easily recognizable symbol helps viewers quickly identify the oil-producing states on the map.
On most maps and charts, it is a star that is the state capital.
Bobby was unsure what the map symbol meant.He asked a local if he knew the meaning of the unusual map symbol.
A symbol is a picture on a map. It is usually small and if you look it up in the map key it tells you what that symbol on the map is, and a little description of one or two words saying what that symbol means or stands for.
the map key
The symbol for a field on a map is typically represented by a green area or patch, often accompanied by a pattern or texture that indicates agricultural use. In some maps, it may also be shown as a grid or with icons depicting crops. Cartographic symbols can vary depending on the map's purpose and the conventions used by the cartographer. Always refer to the map's legend for specific symbol meanings.
There are many map symbols usually found on a map.
What is a map key
What is a map key