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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. Radio-frequency identification - Wikipedia

    en.wikipedia.org/wiki/Radio-frequency_identification

    Radio-frequency identification ( RFID) uses electromagnetic fields to automatically identify and track tags attached to objects. An RFID system consists of a tiny radio transponder called a tag, a radio receiver, and a transmitter. When triggered by an electromagnetic interrogation pulse from a nearby RFID reader device, the tag transmits ...

  4. Check-in QR code - Wikipedia

    en.wikipedia.org/wiki/Check-in_QR_code

    The venue code (left) and digital sentry (right) used in Shanghai, China. The check-in code or the venue code ( Chinese: 场所 码, Chǎngsuǒgmǎ) is a QR code to record check-in locations for contact tracing and epidemiologic investigations. It was widely used in Australia and China during the COVID-19 pandemic in 2020–2022.

  5. Barcode - Wikipedia

    en.wikipedia.org/wiki/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 barcode ...

  6. Electronic badge - Wikipedia

    en.wikipedia.org/wiki/Electronic_Badge

    Electronic badge. An electronic badge (or electronic conference badge) is a gadget that is a replacement for a traditional paper-based badge or pass issued at public events. [1] It is mainly handed out at computer (security) conferences and hacker events. [2] Their main feature is to display the name of the attendee, but due to their electronic ...

  7. Common Access Card - Wikipedia

    en.wikipedia.org/wiki/Common_Access_Card

    The common access card, also commonly referred to as the CAC, is the standard identification for active duty United States defense personnel. The card itself is a smart card about the size of a credit card. [1] Defense personnel that use the CAC include the Selected Reserve and National Guard, United States Department of Defense (DoD) civilian ...

  8. Barcode reader - Wikipedia

    en.wikipedia.org/wiki/Barcode_reader

    Barcode reader. A stationary barcode scanner for a conveyor line. A barcode reader or barcode scanner is an optical scanner that can read printed barcodes and send the data they contain to computer. [1] Like a flatbed scanner, it consists of a light source, a lens, and a light sensor for translating optical impulses into electrical signals.

  9. Cleversafe Inc. - Wikipedia

    en.wikipedia.org/wiki/Cleversafe_Inc.

    125 - 210 (2014 - 2015) [5] [6] Cleversafe Inc. was an object storage software and systems developer company. [7] It was founded in 2004 by Chris Gladwin, an American technology entrepreneur. [8] [5] The company was acquired by IBM in 2015, [9] and became an integral part of IBM Cloud Object Storage. [10]

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