Legend

A legend is the description of the types of features included in a map, usually displayed in the map layout. Legends often use graphics of symbols or examples of features from the map with a written description of what each symbol or graphic represents.

Source: [ESRI GIS dictionary](http://support.esri.com/en/knowledgebase/GISDictionary/term/legend)

See also: * http://geoawesomeness.com/hidden-meanings-maps-lines-legend/ * http://cartography.uni-muenster.de/en/packaging * https://www.mapbox.com/mapbox.js/example/v1.0.0/custom-legend/ * https://www.mapbox.com/mapbox.js/example/v1.0.0/scale-control/