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English definition of “light pen”

light pen

noun [C]
 
 
IT
a pen-shaped object that uses beams of light to read bar codes (= small rectangular patterns of printed lines that store data) or that you use to touch a computer screen in order to choose information: Outgoing inventory can be quickly checked with light pens connected to each terminal.
(Definition of light pen from the Cambridge Business English Dictionary © Cambridge University Press)
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