Isopleth is a term commonly used in geography and cartography to refer to a line on a map that connects points of equal value. This term can be broken down into two Greek words; "Iso" meaning equal and "plethos" meaning value. Synonyms for isopleth include contour line, isopleth line, isarithm, isochrone, and isogram. These synonyms are often used interchangeably and have the same basic meaning of connecting points of equal value on a map. Isopleth maps are used in a variety of fields such as meteorology, geology, and ecology to display data such as temperature, elevation, precipitation, and population density.