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  2. VisiCalc - Wikipedia

    en.wikipedia.org/wiki/VisiCalc

    VisiCalc ("visible calculator") [1] is the first spreadsheet computer program for personal computers, [2] originally released for the Apple II by VisiCorp on October 17, 1979. [1] [3] It is considered the killer application for the Apple II, [4] turning the microcomputer from a hobby for computer enthusiasts into a serious business tool, and then prompting IBM to introduce the IBM PC two years ...

  3. List of ISO 639 language codes - Wikipedia

    en.wikipedia.org/wiki/List_of_ISO_639_language_codes

    This table lists all two-letter codes (set 1), one per language for ISO 639 macrolanguage, and some of the three-letter codes of the other sets, formerly parts 2 and 3. Entries in the Scope column distinguish: Individual language; Collections of related languages; Macrolanguages; The Type column distinguishes: Ancient languages (extinct since ...

  4. Electronic Product Code - Wikipedia

    en.wikipedia.org/wiki/Electronic_Product_Code

    An EPC RFID tag used by Wal-Mart.. The Electronic Product Code (EPC) is designed as a universal identifier (using an idiosyncratic numerical code for each different commodity [1]) that provides a unique identity for every physical object anywhere in the world, for all time.

  5. Primary color - Wikipedia

    en.wikipedia.org/wiki/Primary_color

    Descriptions of primary colors come from areas including philosophy, art history, color order systems, and scientific work involving the physics of light and perception of color. Art education materials commonly use red, yellow, and blue as primary colors, sometimes suggesting that they can mix all colors.

  6. Abacus - Wikipedia

    en.wikipedia.org/wiki/Abacus

    The abacus has an advantage of not requiring a writing implement and paper (needed for algorism) or an electric power source. Merchants, traders, and clerks in some parts of Eastern Europe, Russia, China, and Africa use abacuses. The abacus remains in common use as a scoring system in non-electronic table games.

  7. 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. [5] [6] [7] 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; [8] the pattern of position detection was found and determined by applying the least-used ratio (1:1:3 ...

  8. E series of preferred numbers - Wikipedia

    en.wikipedia.org/wiki/E_series_of_preferred_numbers

    Electronic color codecolor-code used to indicate the values of axial electronic components, such as resistors, capacitors, inductors, diodes (also see IEC 60062). Geometric progression; Preferred number; Renard series – used for current rating of electric fuses

  9. Matrix (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Matrix_(mathematics)

    Matrices can be used to compactly write and work with multiple linear equations, that is, systems of linear equations. For example, if A is an m -by- n matrix, x designates a column vector (that is, n ×1-matrix) of n variables x 1 , x 2 , ..., x n , and b is an m ×1-column vector, then the matrix equation

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