Definition of light pen noun from the Oxford Advanced Learner's Dictionary

     

    light pen

     noun
    noun
    BrE
     
    ; NAmE
     
     
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  1. 1a piece of equipment, shaped like a pen, that is sensitive to light and that can be used to pass information to a computer when it touches the screen
  2. 2a similar piece of equipment that is used for reading barcodes
See the Oxford Advanced American Dictionary entry: light pen