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1541 - Standard for Prefixes for Binary Multiples

The prefixes kilo, mega, giga, etc. are defined by the SI Brochure, "International System of Units", and other international standards to stand solely for powers of 10. Using them to stand for binary multiples, such as powers of 1024, is internationally deprecated. Alternative but conveniently similar prefixes standing for multiples of 1024 are provided by the ISO/IEC 80000 standard series, "Quantities and Units", and by NIST, with which this standard is consistent.
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