The concept of a map key, or legend, can be traced back to ancient times, but it became more standardized in the 16th century during the Age of Exploration. While there isn't a specific year pinpointed for its invention, the practice of using symbols and keys to explain maps gained prominence with the development of more detailed and thematic maps in that era.
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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.
Another name for a map legend is key.
The key on a map explains what the symbols and images on the map mean.
harry beck invented the underground map
The key of the map explains all the symbols used on the map.
on a map key key you can find and locate where or what something is.=]
the teacher asked us to draw up a key for our map.
the map key is the box that tells you what the icons mean in a map
The key on a map explains what the symbols and images on the map mean.