graticule

noun4

1. •
   A grid of horizontal and vertical lines; specifically, one used as a guide to proportionately enlarge or reduce a drawing.
2. •
   The network of lines of latitude and longitude that make up a coordinate system such as the one used for charts and maps of the Earth.
3. •
   (UK) Synonym of reticle (“a transparent plate marked with a crosshair, grid, or scale which is used in an optical instrument, etc., to aid in alignment, counting, or measurement of objects being observed; also, the crosshair, grid, or scale on such a plate”).
4. •
   A (nearly) rectangular or square region created by a grid of horizontal and vertical lines.