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  2. Preferred number - Wikipedia

    en.wikipedia.org/wiki/Preferred_number

    Preferred numbers represent preferences of simple numbers (such as 1, 2, and 5) multiplied by the powers of a convenient basis, usually 10. [1] Comparison of preferred numbers of the 1-2-5, Renard and f-stop series on a logarithmic scale divided into 40 equal intervals (blue)

  3. File:Preferred numbers.svg - Wikipedia

    en.wikipedia.org/wiki/File:Preferred_numbers.svg

    Comparison of preferred numbers of the 1-2-5, Renard and f-stop series on a logarithmic scale divided into 40 equal intervals (blue) by CMG Lee. Source Own work

  4. E series of preferred numbers - Wikipedia

    en.wikipedia.org/wiki/E_series_of_preferred_numbers

    The E series is a system of preferred numbers (also called preferred values) derived for use in electronic components. It consists of the E3, E6, E12, E24, E48, E96 and E192 series, [1] where the number after the 'E' designates the quantity of logarithmic value "steps" per decade.

  5. Renard series - Wikipedia

    en.wikipedia.org/wiki/Renard_series

    Renard series are a system of preferred numbers dividing an interval from 1 to 10 into 5, 10, 20, or 40 steps. [1] This set of preferred numbers was proposed ca. 1877 by French army engineer Colonel Charles Renard [ 2 ] [ 3 ] [ 4 ] and reportedly published in an 1886 instruction for captive balloon troops, thus receiving the current name in ...

  6. Convenient number - Wikipedia

    en.wikipedia.org/wiki/Convenient_number

    A convenient number is a number which in several situations can prove convenient for use by humans for counting and measuring, and is related to preferred numbers (which are standard recommendations used for choosing product dimensions).

  7. E3 series - Wikipedia

    en.wikipedia.org/wiki/E3_series

    Download as PDF; Printable version; In other projects Wikidata item ... E3 series may refer to: E3 series (preferred numbers), a series of standardized resistor and ...

  8. Preferred metric sizes - Wikipedia

    en.wikipedia.org/wiki/Preferred_metric_sizes

    The number following the DN is a nominal value that is roughly the number of millimeters of a circular feature on the connection point of the pipe, fitting, coupling, etc., but often differing by a noticeable amount. If the DN value is related to the internal bore diameter of the feature, the size should be represented by DN/ID (for Inside ...

  9. FTR - Wikipedia

    en.wikipedia.org/wiki/Ftr

    Federal Taxpayer Registry (Spanish: Registro Federal de Contribuyentes), Mexican tax identification number; Financial transmission right, in electricity markets; Formylmethanofuran—tetrahydromethanopterin N-formyltransferase; Frontier Communications, an American telecommunications company