What is the term for a grid made up of base lines and meridian lines in property descriptions?

The term for a grid made up of base lines and meridian lines in property descriptions is commonly known as "Ranges and township lines." This grid system is part of the Public Land Survey System (PLSS), which is used primarily in the western United States. In this system, meridians (which run north-south) and base lines (which run east-west) intersect to create townships and ranges, forming a structured method for identifying parcels of land.

This organized approach allows for clear and consistent descriptions of land, making it easier to locate and reference specific plots. Each township is typically six miles square and is further divided into sections, each measuring one mile by one mile.

Other terms may refer to different aspects of land measurement or surveying, but "Ranges and township lines" distinctly captures the essence of the grid formed by base and meridian lines.