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  2. Cicada 3301 - Wikipedia

    en.wikipedia.org/wiki/Cicada_3301

    Cicada 3301 logo. Cicada 3301 is the name given to three sets of puzzles posted under the name "3301" online between 2012 and 2014. The first puzzle started on January 4, 2012, on 4chan and ran for nearly a month.

  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. 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 ...

  4. Unstructured Supplementary Service Data - Wikipedia

    en.wikipedia.org/wiki/Unstructured_Supplementary...

    Unstructured Supplementary Service Data. Unstructured Supplementary Service Data ( USSD ), sometimes referred to as " quick codes " or " feature codes ", is a communications protocol used by GSM cellular telephones to communicate with the mobile network operator 's computers. USSD can be used for WAP browsing, prepaid callback service, mobile ...

  5. List of airline codes - Wikipedia

    en.wikipedia.org/wiki/List_of_airline_codes

    Download QR code; Wikidata item; Print/export Download as PDF; Printable version; Appearance. move to sidebar hide ... LINK SERVICE Spain ARL Airlec - Air Aquitaine ...

  6. Facebook onion address - Wikipedia

    en.wikipedia.org/wiki/Facebook_onion_address

    The network address it used at the time – facebookcorewwwi.onion – is a backronym that stands for Facebook's Core WWW Infrastructure. [7] In April 2016, it had been used by over 1 million people monthly, up from 525,000 in 2015. [3] Google does not operate sites through Tor, and Facebook has been applauded for allowing such access, [11 ...

  7. FOAF - Wikipedia

    en.wikipedia.org/wiki/FOAF

    FOAF (an acronym of friend of a friend) is a machine-readable ontology describing persons, their activities and their relations to other people and objects. Anyone can use FOAF to describe themselves. FOAF allows groups of people to describe social networks without the need for a centralised database. FOAF is a descriptive vocabulary expressed ...

  8. PDF417 - Wikipedia

    en.wikipedia.org/wiki/PDF417

    PDF417 is a stacked linear barcode format used in a variety of applications such as transport, identification cards, and inventory management. "PDF" stands for Portable Data File. The "417" signifies that each pattern in the code consists of 4 bars and spaces in a pattern that is 17 units (modules) long.

  9. 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 ...

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