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  2. 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 ...

  3. Reed–Solomon error correction - Wikipedia

    en.wikipedia.org/wiki/Reed–Solomon_error...

    The Reed–Solomon code is actually a family of codes, where every code is characterised by three parameters: an alphabet size , a block length, and a message length, with <. The set of alphabet symbols is interpreted as the finite field F {\displaystyle F} of order q {\displaystyle q} , and thus, q {\displaystyle q} must be a prime power .

  4. Tire code - Wikipedia

    en.wikipedia.org/wiki/Tire_code

    The DOT code [ 1] is an alphanumeric character sequence molded into the sidewall of the tire and allows the identification of the tire and its age. The code is mandated by the U.S. Department of Transportation [ 2] but is used worldwide. [ 3] The DOT code is also useful in identifying tires subject to product recall [ 4] or at end of life due ...

  5. Ten-code - Wikipedia

    en.wikipedia.org/wiki/Ten-code

    Ten-code. Ten-codes, officially known as ten signals, are brevity codes used to represent common phrases in voice communication, particularly by US public safety officials and in citizens band (CB) radio transmissions. The police version of ten-codes is officially known as the APCO Project 14 Aural Brevity Code. [1]

  6. International Phonetic Alphabet - Wikipedia

    en.wikipedia.org/wiki/International_Phonetic...

    The official chart of the IPA, revised in 2020. The International Phonetic Alphabet ( IPA) is an alphabetic system of phonetic notation based primarily on the Latin script. It was devised by the International Phonetic Association in the late 19th century as a standard written representation for the sounds of speech. [ 1]

  7. 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 ...

  8. Snellen chart - Wikipedia

    en.wikipedia.org/wiki/Snellen_chart

    In the most familiar acuity test, a Snellen chart is placed at a standard distance: 6 metres. At this distance, the symbols on the line representing "normal" acuity subtend an angle of five minutes of arc, and the thickness of the lines and of the spaces between the lines subtends one minute of arc. This line, designated 6/6 (or 20/20), is the ...

  9. Explainer: How CrowdStrike knocked the world offline - AOL

    www.aol.com/finance/explainer-crowdstrike...

    Said Benjamin Lee, a professor of computer and information science at the University of Pennsylvania: “Any computer system that does not install the update will be at risk of attack with a known ...

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