Barcode reader

• Device for interacting with a computer screen

Longman Dictionary of Contemporary English Word definitions in Longman Dictionary of Contemporary English
noun EXAMPLES FROM CORPUS ▪ And when the program is ready, the student enters it simply by moving a light pen across the bar codes. ▪ When the light pen is moved over the code, it triggers the chips to make sound through the loudspeaker.

Wiktionary Word definitions in Wiktionary
n. (context computing English) A pen-like device allowing a computer user to interact with the screen display.

WordNet Word definitions in WordNet
n. (computer science) a pointer that when pointed at a computer display senses whether or not the spot is illuminated [syn: electronic stylus ]

Wikipedia Word definitions in Wikipedia
A light pen is a computer input device in the form of a light-sensitive wand used in conjunction with a computer's CRT display . It allows the user to point to displayed objects or draw on the screen in a similar way to a touchscreen but with greater positional ...