CARTOGRAM
Noun
cartogram (plural cartograms)
(dated) A map used to indicate geographically-bound statistical information, typically region-by-region values of a given variable, for example by using different shadings for different ranges of values.
A map-like graph where the relative areas of graph regions are proportional not to the relative areas of the land regions they represent, but rather to another quantitative variable, such as population or gross domestic product.
Synonyms
• A map-like chart: area cartogram, isodemographic map (when the variable used is population), value-by-area map
Source: Wiktionary
Car"to*gram, n. [F. cartogramme.]
Definition: A map showing geographically, by shades or curves, statistics
of various kinds; a statistical map.
Source: Webster’s Unabridged Dictionary 1913 Edition