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  2. Category:POSIX error codes - Wikipedia

    en.wikipedia.org/wiki/Category:POSIX_error_codes

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Help; Learn to edit; Community portal; Recent changes; Upload file

  3. Help:Markup validation - Wikipedia

    en.wikipedia.org/wiki/Help:Markup_validation

    The W3C Markup Validation Service lets editors check web pages for conformance to HTML and XHTML standards. It is helpful for catching minor problems such as duplicate section names or citation IDs.

  4. W3C Markup Validation Service - Wikipedia

    en.wikipedia.org/wiki/W3C_Markup_Validation_Service

    The Markup Validation Service is a validator by the World Wide Web Consortium (W3C) that allows Internet users to check pre-HTML5 HTML and XHTML documents for well-formed markup against a document type definition (DTD). Markup validation is an important step towards ensuring the technical quality of web pages.

  5. ISO 8583 - Wikipedia

    en.wikipedia.org/wiki/ISO_8583

    ISO 8583 is an international standard for financial transaction card originated interchange messaging. It is the International Organization for Standardization standard for systems that exchange electronic transactions initiated by cardholders using payment cards.

  6. NPM - Wikipedia

    en.wikipedia.org/wiki/NPM

    npm, Inc., a software development and hosting company based in California, United States NPM/CNP (Compagnie Nationale à Portefeuille SA), a Belgian non-listed holding company New People's Militia in Manipur, India

  7. errno.h - Wikipedia

    en.wikipedia.org/wiki/Errno.h

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Special pages; Pages for logged out editors learn more

  8. Card security code - Wikipedia

    en.wikipedia.org/wiki/Card_security_code

    There are several types of security codes and PVV (all generated from DES key in the bank in HSM modules using PAN, expiration date and service code): . The first code, 3 numbers, called CVC1 or CVV1, is encoded on track one and two of the magnetic stripe of the card and used for card present transactions, with signature (second track also contains pin verification value, PVV, but now it is ...

  9. Luhn algorithm - Wikipedia

    en.wikipedia.org/wiki/Luhn_algorithm

    The Luhn algorithm or Luhn formula, also known as the "modulus 10" or "mod 10" algorithm, named after its creator, IBM scientist Hans Peter Luhn, is a simple check digit formula used to validate a variety of identification numbers. It is described in US patent 2950048A, granted on 23 August 1960. [1]