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  2. QR code - Wikipedia

    en.wikipedia.org/wiki/QR_code

    The QR code system was invented in 1994, at the Denso Wave automotive products company, in Japan. The initial alternating-square design presented by the team of researchers, headed by Masahiro Hara, was influenced by the black counters and the white counters played on a Go board; the pattern of position detection was found and determined by applying the least-used ratio (1:1:3:1:1) in black ...

  3. Barcode - Wikipedia

    en.wikipedia.org/wiki/Barcode

    Barcode. A UPC-A barcode. A barcode or bar code is a method of representing data in a visual, machine-readable form. Initially, barcodes represented data by varying the widths, spacings and sizes of parallel lines. These barcodes, now commonly referred to as linear or one-dimensional (1D), can be scanned by special optical scanners, called ...

  4. Luhn algorithm - Wikipedia

    en.wikipedia.org/wiki/Luhn_algorithm

    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 U.S. Patent No. 2,950,048, granted on August 23, 1960.

  5. List of flashcard software - Wikipedia

    en.wikipedia.org/wiki/List_of_flashcard_software

    Free-of-charge version available Spaced repetition Number of sides Supports Unicode Supports image Supports audio Other formats Printable Import-export Supports sync Plugin support Working offline Anki: AGPLv3 (personal computer, Android), proprietary Yes (except iOS) Yes Multiple Yes Yes Yes Video, LaTeX, HTML: Plugin: Yes Yes Yes Yes

  6. Business card - Wikipedia

    en.wikipedia.org/wiki/Business_card

    Business cards can be mass-produced by a printshop or printed at home using business card software. Such software typically contains design, layout tools, and text editing tools for designing one's business cards. Most business card software integrates with other software (like mail clients or address books) to eliminate the need of entering ...

  7. List of free and open-source software packages - Wikipedia

    en.wikipedia.org/wiki/List_of_free_and_open...

    This is a list of free and open-source software packages, computer software licensed under free software licenses and open-source licenses. Software that fits the Free Software Definition may be more appropriately called free software ; the GNU project in particular objects to their works being referred to as open-source . [1]

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