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  2. List of HTTP status codes - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_status_codes

    The RFC specifies this code should be returned by teapots requested to brew coffee. [18] This HTTP status is used as an Easter egg in some websites, such as Google.com's "I'm a teapot" easter egg. [ 19 ] [ 20 ] [ 21 ] Sometimes, this status code is also used as a response to a blocked request, instead of the more appropriate 403 Forbidden.

  3. Null pointer - Wikipedia

    en.wikipedia.org/wiki/Null_pointer

    In some programming language environments (at least one proprietary Lisp implementation, for example), [citation needed] the value used as the null pointer (called nil in Lisp) may actually be a pointer to a block of internal data useful to the implementation (but not explicitly reachable from user programs), thus allowing the same register to be used as a useful constant and a quick way of ...

  4. User error - Wikipedia

    en.wikipedia.org/wiki/User_error

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

  5. Discover Card - Wikipedia

    en.wikipedia.org/wiki/Discover_Card

    Discover is the third largest credit card brand in the U.S., with 60.6 million cardholders or about 8% of cards in circulation, placing it well behind Visa (48%) and Mastercard (36%), but slightly ahead of American Express (7.5%).

  6. 3 Places that Don't Take Discover Credit Cards - AOL

    www.aol.com/3-places-dont-discover-credit...

    It features a 0% intro APR for 15 months, a cash back rate of up to 5%, and all somehow for no annual fee! Click here to read our full review for free and apply in just 2 minutes.

  7. 500 error - Wikipedia

    en.wikipedia.org/?title=500_error&redirect=no

    List of HTTP status codes#500 To a section : This is a redirect from a topic that does not have its own page to a section of a page on the subject. For redirects to embedded anchors on a page, use {{ R to anchor }} instead .

  8. Card security code - Wikipedia

    en.wikipedia.org/wiki/Card_security_code

    The card security code is not encoded on the magnetic stripe but is printed flat. American Express cards have a four-digit code printed on the front side of the card above the number. Diners Club, Discover, JCB, Mastercard, and Visa credit and debit cards have a three-digit card security code. The code is the final group of numbers printed on ...

  9. Payment card number - Wikipedia

    en.wikipedia.org/wiki/Payment_card_number

    A payment card number, primary account number (PAN), or simply a card number, is the card identifier found on payment cards, such as credit cards and debit cards, as well as stored-value cards, gift cards and other similar cards. In some situations the card number is referred to as a bank card number. The card number is primarily a card ...