A map key should include symbols, lables and explanations.
Key
so you can know what the colors on the map means
The key on a map identifies symbols that are used on that map, for example, different maps may use a different symbol to highlight a hospital's location, so each map has a key - or a legend - to explain it's symbols. For example:an airplane for an airport.
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.
A map key will have the meaning of the different symbols that are found on a map. So if there are tree symbols on the map the key may explain that these symbols mean there is a park in those locations.
A map will have a key that will explain what the symbols mean such as railroad, airport, or highway.
Key elements found on a map include a scale to show the ratio of distance on the map to real-world distance, a legend to explain symbols used on the map, symbols representing physical and cultural features, and a compass rose to indicate cardinal directions.
A map key
The map key, also known as the legend, has been used in maps for centuries. It is difficult to attribute its invention to a single person or culture as various civilizations throughout history have utilized keys to explain symbols and features on maps.
the key or legend, that is the technical term, tells you what each symbol on the map represents. the symbols can mean different things so check the key or legend for help knowing what the symbols mean.
You can look for a map legend or key, typically found in a corner of the map, to help you understand the symbols used on the map. The legend will explain what each symbol represents, such as roads, landmarks, or other features. If the legend is not available, you can also check the map's accompanying guide or legend online for clarification.
Another name for a map legend is key.