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  2. Merchant category code - Wikipedia

    en.wikipedia.org/wiki/Merchant_category_code

    A merchant category code (MCC) is a four-digit number used for retail financial services to classify a business by the types of goods or services it provides. Codes are specified by the ISO 18245 standard.

  3. 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 ...

  4. One-time password - Wikipedia

    en.wikipedia.org/wiki/One-time_password

    MasterCard SecureCode uses OTAC to confirm a user's identity One time authorization code as used in Yammer's desktop client. A one-time password (OTP), also known as a one-time PIN, one-time passcode, one-time authorization code (OTAC) or dynamic password, is a password that is valid for only one login session or transaction, on a computer system or other digital device.

  5. Creator code - Wikipedia

    en.wikipedia.org/wiki/Creator_code

    Creator codes have been internally superseded by Apple's Uniform Type Identifier scheme, which manages application and file type identification as well as type codes, creator codes and file extensions. To avoid conflicts, Apple maintained a database of creator codes in use. Developers could fill out an online form to register their codes. [2]

  6. Safety pin - Wikipedia

    en.wikipedia.org/wiki/Safety_pin

    A safety pin. A ribbon and badge attached to a school cap with safety pins. A safety pin is a variation of the regular pin which includes a simple spring mechanism and a clasp. . The clasp forms a closed loop to properly fasten the pin to whatever it is applied to and covers the end of the pin to protect the user from the sharp poi

  7. Split pin - Wikipedia

    en.wikipedia.org/wiki/Split_pin

    A split pin, also known as a cotter pin, or cotter key in the US, [1] is a metal fastener with two tines that are bent during installation, similar to a staple or rivet. Typically made of thick wire with a half-circular cross section, split pins come in multiple sizes and types.