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2 definitions found
 for light pen
From WordNet (r) 3.0 (2006) :

  light pen
      n 1: (computer science) a pointer that when pointed at a
           computer display senses whether or not the spot is
           illuminated [syn: light pen, electronic stylus]

From The Free On-line Dictionary of Computing (30 December 2018) :

  light pen
  
      An early pointing device which the user pointed
     at a raster-scanned display screen.  A photocell in the
     pen detected the flying spot of the raster scan.  The position
     of the spot at that instant, obtained from the scanning
     electronics, was made available to software as (x, y)
     co-ordinates.
  
     (2003-12-02)
  

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