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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 .
In industrial design, preferred numbers (also called preferred values or preferred series) are standard guidelines for choosing exact product dimensions within a given set of constraints. Product developers must choose numerous lengths, distances, diameters, volumes, and other characteristic quantities .
E series of preferred numbers, a series of preferred values for electronic components; E series, a line of server-class Intel Xeon CPUs; HP E series, a series of digital cameras; Nokia Eseries, Nokia business-oriented smartphones
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An NBS technical note describes that system of convenient metric values as the 1-2-5 series in reverse, with assigned preferences for those numbers which are multiples of 5, 2, and 1 (plus their powers of 10). Linear dimensions above 100 mm were excluded (because such measurements are defined by another set of rules).
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E6 series (number series), of preferred numbers for electronic components E6 (mathematics), a Lie group in mathematics E 6 polytope, in geometry; Thyroiditis (ICD-10 code: E06); E-6 process, a common photographic process for developing transparency film