In optical character recognition, a system of two groups of parallel lines, perpendicular to each other, used to measure or specify character images.

A network of equally spaced lines forming squares, used for determining permissible locations of holes on a printed circuit board or a chassis.

1. A metal plate with holes or ridges, used in a storage cell or battery as a conductor and a support for the active material.

2. Any systematic network, such as of telephone lines or power lines.

An electrode located between the cathode and anode of an electron tube, which has one or more openings through which electrons or ions can pass, and serves to control the flow of electrons from cathode to anode.

A system of uniformly spaced perpendicular lines and horizontal lines running north and south, and east and west on a map, chart, or aerial photograph; used in locating points.

See <<Potter-Bucky grid>>

Imaginary line used to divide the surface of an area when following a checkerboard placement of boreholes.