A graticule or grid (from Latin crāticula 'grill/grating'), on a map, is a graphical depiction of a coordinate system as a grid of coordinate curves or "lines", each curve/line representing a constant coordinate value. It is thus a form of isoline, and is commonly found on maps of many kinds, at scales from local to global.
The term graticule is almost always used to specifically refer to the parallels and meridians of latitude and longitude, respectively. In modern usage, graticules are contrasted with grids, which display the eastings and northings of a projected coordinate reference system, such as Universal Transverse Mercator – usually the coordinate system in which the map is drawn.
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