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  2. Gini coefficient - Wikipedia

    en.wikipedia.org/wiki/Gini_coefficient

    For example, if the wealthiest u = 20% of the population has f = 80% of all income (see Pareto principle), the income Gini coefficient is at least 60%. In another example, [28] if u = 1% of the world's population owns f = 50% of all wealth, the wealth Gini coefficient is at least 49%.

  3. 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 ...

  4. Area codes 718, 347, and 929 - Wikipedia

    en.wikipedia.org/wiki/Area_codes_718,_347,_and_929

    Area code 929 became effective on April 16, 2011. This had the effect of assigning 23.4 million numbers to an area of 6.7 million people. As of April 2023, NPA 347/718/929 has a projected exhaustion date of the second quarter of 2027. Area code 917 overlays area codes 718, 347, and 929, as well as area codes 212, 646 and 332 in Manhattan.

  5. Benford's law - Wikipedia

    en.wikipedia.org/wiki/Benford's_law

    Picking a random x position uniformly on this number line, roughly 30% of the time the first digit of the number will be 1. A set of numbers is said to satisfy Benford's law if the leading digit d (d ∈ {1, ..., 9}) occurs with probability

  6. Telephone numbers in Brazil - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_Brazil

    To call the number (19) 4001-3579 from a payphone in Piracicaba (within area 19, but outside the metropolitan region of Campinas): 0 XX 19 4001 3579. To call the number (19) 4001-3456 from a cell phone working in Rio Claro (also outside the Metropolitan Region of Campinas, but also in area 19 ): 4001 3456.

  7. Imaginary number - Wikipedia

    en.wikipedia.org/wiki/Imaginary_number

    An imaginary number is the product of a real number and the imaginary unit i, [note 1] which is defined by its property i2 = −1. [1] [2] The square of an imaginary number bi is −b2. For example, 5i is an imaginary number, and its square is −25. The number zero is considered to be both real and imaginary. [3]