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What is a scanner?

What is a scanner? Here are some definitions.

Noun
  1. A device which scans documents in order to convert them to a digital medium.
  2. A radio receiver which iterates through a sequence of frequencies to detect signal.
  3. A device which uses radiation (ultrasound, X-ray, etc.) to generate images of tissue or surfaces for diagnostic purposes.
  4. A device which uses optics to detect printed data (such as a barcode).
  5. One who scans.
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What was intended as an investigation into how well the carvings would be recorded by a laser scanner, turned into a major discovery.
A simple port scanner can be written in under 15 minutes by a good programmer in a language such as Java or Perl.
The scanner reads the barcode into the spreadsheet, and the calipers magically transmit your measurements there as well.
Computers, printers, telephones, answering machines, and a fax machine and scanner were stolen.
The radioactive glucose emits gamma rays which are then detected by the scanner.
Yes, like a supermarket scanner reads the bar code on a bag of potato chips.

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