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  2. What’s a Personal Identification Number (PIN) - AOL

    www.aol.com/finance/personal-identification...

    An individual’s PIN is the four-digit code they set after opening a debit account with their bank of choice. It is used as a layer of authentication when they perform an electronic transaction ...

  3. Personal identification number - Wikipedia

    en.wikipedia.org/wiki/Personal_identification_number

    A personal identification number (PIN; sometimes redundantly a PIN code or PIN number) is a numeric (sometimes alpha-numeric) passcode used in the process of authenticating a user accessing a system. The PIN has been the key to facilitating the private data exchange between different data-processing centers in computer networks for financial ...

  4. Personal unblocking key - Wikipedia

    en.wikipedia.org/wiki/Personal_unblocking_key

    If the wrong PIN is entered more than three times, the SIM card will become locked. It can be unlocked by entering the PUK code provided by the mobile service provider, [1] which may be available on the SIM card's packaging, the contract, or provided by customer service after identity verification. After the PUK code is entered, the PIN must be ...

  5. 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 ...

  6. List of postal codes - Wikipedia

    en.wikipedia.org/wiki/List_of_postal_codes

    The first three digits of the postal code are required; the last two or three digits are optional. Codes are known as yóu dì qū hào (郵遞區號), and are also assigned to Senkaku Islands (Diaoyutai), though Japanese-administered, Pratas Island and the Spratly Islands. NNN-NNN 3+3 digit codes were launched on March 3, 2020.

  7. Postal code - Wikipedia

    en.wikipedia.org/wiki/Postal_code

    Postal codes are known as Postal Index Numbers (PINs; sometimes as PIN codes) in India. The PIN system was introduced on 15 August 1972 by India Post. India uses a unique six-digit code as a geographical number to identify locations in India. The format of the PIN is ZSDPPP defined as follows: Z – Zone S – Sub-zone D – Sorting District

  8. Postal Index Number - Wikipedia

    en.wikipedia.org/wiki/Postal_Index_Number

    2-digit postcode areas in India (defined through the first two PIN digits) The third digit of a PIN, combined with the first two digits, represents a specific geographical region (except in the case of the functional zone for the Army) called a sorting district that is headquartered at the main post office of the largest city in the region and ...

  9. Payment card number - Wikipedia

    en.wikipedia.org/wiki/Payment_card_number

    [2]: 33 [3] The remaining numbers, except the last digit, are the individual account identification number. The last digit is the Luhn check digit. The last digit is the Luhn check digit. IINs and PANs have a certain level of internal structure and share a common numbering scheme set by ISO/IEC 7812.