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CAPTCHA
trademark /ˈkæpˌtʃə/
  1. computing completely automated public Turing test to tell computers and humans apart: a system for checking that a human is using a computer, often consisting of a group of letters in strange shapes that the person must type again
     Synonyms and related words
    Codes and codification:alphanumeric, break, CAPTCHA...
CAPTCHA
noun

or captcha

  1. From our crowdsourced Open Dictionary
    an acronym which describes a program that protects websites from spammers by providing a test (e.g. a distorted text) which humans can do but computers cannot. It stands for 'Completely Automated Public Turing Test To Tell Computers and Humans Apart' and is a trademark of Carnegie Mellon University. There are visual as well as audio captchas in use.

    Recognising the kinds of characters used in CAPTCHAs remains a significant challenge in computer vision.

    Submitted on 28/09/2009

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