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  2. Dual code - Wikipedia

    en.wikipedia.org/wiki/Dual_code

    In linear algebra terms, the dual code is the annihilator of C with respect to the bilinear form . The dimension of C and its dual always add up to the length n : A generator matrix for the dual code is the parity-check matrix for the original code and vice versa. The dual of the dual code is always the original code.

  3. Mail - Wikipedia

    en.wikipedia.org/wiki/Mail

    A postman collecting mail for delivery. The mail or post is a system for physically transporting postcards, letters, and parcels. [1] A postal service can be private or public, though many governments place restrictions on private systems. Since the mid-19th century, national postal systems have generally been established as a government ...

  4. Paysafecard - Wikipedia

    en.wikipedia.org/wiki/Paysafecard

    paysafecard (as a brand stylized in lowercase) is part of Paysafe Limited (“Paysafe”) (NYSE: PSFE) (PSFE.WS), a global payments platform. Paysafecard is a prepaid cash-based, online payment method based on vouchers with a 16-digit PIN code. The vouchers can be used to fund online transactions without a bank account, credit card, or other ...

  5. ISO 8583 - Wikipedia

    en.wikipedia.org/wiki/ISO_8583

    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 . ISO 8583 defines a message format and a communication flow so that ...

  6. GiftCards.com - Wikipedia

    en.wikipedia.org/wiki/GiftCards.com

    GiftCards.com. GiftCards.com is an online gift-card retailer based in Pittsburgh, Pennsylvania. [1] [2] The company sells gift cards for thousands of different large corporate retailers and small businesses [3] including Vanillagifts.com, Best Buy, Barnes & Noble, Sephora, Coach, Amazon.com, and others. [4] [5] [6] The company also offers ...

  7. Personal identification number - Wikipedia

    en.wikipedia.org/wiki/Personal_identification_number

    Personal identification number. A personal identification number ( PIN ), or sometimes redundantly a PIN number or PIN code, 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 ...