light pen

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Synonyms for light pen

(computer science) a pointer that when pointed at a computer display senses whether or not the spot is illuminated

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Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
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In other words, if a student wants to turn a wrench on a bolt located on the box, he or she will select a "wrench" from the computer's toolbox with the lightpen and then touch the pen to the bolt.
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