- noun a pointing device that is operated by moving it across a mat on which is printed a grid of lines
- noun a pointing device that is operated by moving it across a special flat mat;
- A computer mouse whose movements are converted into electrical signals via optical means. For example, such a mouse may rest upon a reflective grid which detects the movements of a light situated under said mouse.
- A mouse, such as an infrared mouse, which communicates with a computer using optical signals, as opposed to a cord.