light pen

ˈlight ˌpen, n. [countable]

a light-sensitive device used for pointing at characters or objects on a computer screen.

light′ pen′, [Computers.]

Computinga hand-held light-sensitive device used for pointing at characters or objects on a CRT in order to make or modify drawings or to indicate functions to be performed. Also called light′ pen′cil.

Collins Concise English Dictionary © HarperCollins Publishers::

light pen n

- a rodlike device which, when applied to the screen of a cathode-ray tube, can detect the time of passage of the illuminated spot across that point thus enabling a computer to determine the position on the screen being pointed at
- a penlike device, used to read bar codes, that emits light and determines the intensity of that light as reflected from a small area of an adjacent surface

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