The legend of a map shows what the symbols on the map mean and sometimes the scale is also indicated there.
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Map symbols are typically shown in a rectangular or square box with a thin black outline to distinguish them from the rest of the map's features.
The Key, or Legend, or a map gives a list of the symbols used on the map and what they represent. There is a fairly standard set of symbols used for different types of map so that anyone looking at the map can understand what it is being shown. For example, on a weather map a cold front is shown as a black line with semi-circular bumps (in blue if coloured), a warm front is shown as a black line with triangles (in red if coloured) and an occluded front is shown as a black line with alternate semi-circular bumps and triangles.
An antonym for "legend" in the context of a map would be "key." The legend or key on a map provides information about the symbols used, while the key explains the meaning of those symbols. In cartography, the legend is essential for interpreting the map, while the key is crucial for understanding the map's features.
Another name for a map legend is key.
The key of the map explains all the symbols used on the map.