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  2. Square (financial services) - Wikipedia

    en.wikipedia.org/wiki/Square_(financial_services)

    Square is a point-of-sale system for merchants with physical or online stores. [1] [2] Launched in 2009 by Block, Inc., [3] it enables sellers to accept card payments and manage business operations. As of 2023, Square is the U.S. market leader in point-of-sale systems, [4] [5] [6] serving 4 million sellers and processing $210bn annually. [7] [8]

  3. 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. [6] [7] [8] 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; [9] the pattern of the position detection markers was determined by finding the least-used sequence of ...

  4. Block, Inc. - Wikipedia

    en.wikipedia.org/wiki/Block,_Inc.

    Square is a payments platform that allows businesses to accept card payments and use smartphones or tablets or computers as payment registers for a point-of-sale system (POS). [ 73 ] [ 14 ] [ 74 ] The platform was founded in 2009 by Dorsey and McKelvey.

  5. Barcode - Wikipedia

    en.wikipedia.org/wiki/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. Initially, barcodes represented data by varying the widths, spacings and sizes of parallel lines.

  6. Universal Product Code - Wikipedia

    en.wikipedia.org/wiki/Universal_Product_Code

    A UPC barcode. The Universal Product Code (UPC or UPC code) is a barcode symbology that is used worldwide for tracking trade items in stores.. The chosen symbology has bars (or spaces) of exactly 1, 2, 3, or 4 units wide each; each decimal digit to be encoded consists of two bars and two spaces chosen to have a total width of 7 units, in both an "even" and an "odd" parity form, which enables ...

  7. Barcode printer - Wikipedia

    en.wikipedia.org/wiki/Barcode_printer

    A barcode printer. A barcode printer is a computer peripheral for printing barcode [1] labels or tags that can be attached to, or printed directly on, physical objects. Barcode printers are commonly used to label cartons before shipment, or to label retail items with UPCs or EANs. [citation needed]

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