IEC 60027 (formerly IEC 27) is a

technical Technical may refer to: * Technical (vehicle), an improvised fighting vehicle * Technical analysis, a discipline for forecasting the future direction of prices through the study of past market data * Technical drawing, showing how something is co ...

international standard international standard is a technical standard developed by one or more international standards organizations. International standards are available for consideration and use worldwide. The most prominent such organization is the International Or ...

for letter symbols published by the

International Electrotechnical Commission The International Electrotechnical Commission (IEC; in French: ''Commission électrotechnique internationale'') is an international standards organization that prepares and publishes international standards for all electrical, electronic and r ...

(IEC), comprising the following parts: * IEC 60027-1: General * IEC 60027-2: Telecommunications and electronics * IEC 60027-3: Logarithmic and related quantities, and their units * IEC 60027-4: Symbols for quantities to be used for rotating electrical machines * IEC 60027-6: Control technology * IEC 60027-7: Physiological quantities and units A closely related international standard on

quantities Quantity or amount is a property that can exist as a multitude or magnitude, which illustrate discontinuity and continuity. Quantities can be compared in terms of "more", "less", or "equal", or by assigning a numerical value multiple of a unit ...

and

units Unit may refer to: Arts and entertainment * UNIT, a fictional military organization in the science fiction television series ''Doctor Who'' * Unit of action, a discrete piece of action (or beat) in a theatrical presentation Music * Unit (album), ...

ISO 31 ISO 31 (Quantities and units, International Organization for Standardization, 1992) is a superseded international standard concerning physical quantities, units of measurement, their interrrelationships and their presentation. It was revised and ...

. The ISO 31 and IEC 60027 Standards are being revised by the two standardization organizations in collaboration. The revised harmonized standard is known as

ISO/IEC 80000 ISO 80000 or IEC 80000 is an international standard introducing the International System of Quantities (ISQ). It was developed and promulgated jointly by the International Organization for Standardization (ISO) and the International Electrote ...

, Quantities and units. It supersedes both ISO 31 and part of IEC 60027.

IEC 60027-2

IEC 60027-2 Amendment 2, as published in January 1999, was the first international standard defining the

binary prefix A binary prefix is a unit prefix for multiples of units. It is most often used in data processing, data transmission, and digital information, principally in association with the bit and the byte, to indicate multiplication by a power of& ...

es, as proposed by

(IEC) since 1996 ('' kibi-'' (Ki), ''

mebi A binary prefix is a unit prefix for multiples of units. It is most often used in data processing, data transmission, and digital information, principally in association with the bit and the byte, to indicate multiplication by a power of& ...

-'' (Mi), ''

gibi A binary prefix is a unit prefix for multiples of units. It is most often used in data processing, data transmission, and digital information, principally in association with the bit and the byte, to indicate multiplication by a power of& ...

-'' (Gi) and '' tebi-'' (Ti)) but extended them up to '' pebi'' (Pi) and '' exbi-'' (Ei). This didn't change in the second edition of the standard, published in 2000,IEC 60027-2 (2000-11) Ed. 2.0 but the third edition in 2005 added prefixes ''

zebi- A binary prefix is a unit prefix for multiples of Units of measurement, units. It is most often used in data processing, data transmission, and digital information, principally in association with the bit and the byte, to indicate multiplicatio ...

'' (Zi) and ''

yobi- A binary prefix is a unit prefix for multiples of units. It is most often used in data processing, data transmission, and digital information, principally in association with the bit and the byte, to indicate multiplication by a power of& ...

'' (Yi). The harmonized

ISO ISO is the most common abbreviation for the International Organization for Standardization. ISO or Iso may also refer to: Business and finance * Iso (supermarket), a chain of Danish supermarkets incorporated into the SuperBest chain in 2007 * Iso ...

IEC The International Electrotechnical Commission (IEC; in French: ''Commission électrotechnique internationale'') is an international standards organization that prepares and publishes international standards for all electrical, electronic and r ...

IEC 80000-13 ISO 80000 or IEC 80000 is an international standard introducing the International System of Quantities (ISQ). It was developed and promulgated jointly by the International Organization for Standardization (ISO) and the International Electrote ...

:2008 standard supersedes subclauses 3.8 and 3.9 of IEC 60027-2:2005. The only significant change is the addition of explicit definitions for some quantities.

References

External links

*
IEC 60027-7 (2010-05) Ed. 1.0
(IEC Catalog, www.iec.ch) *
IEC 60027-2 (2005-08) Ed. 3.0 Bilingual
(preview) * {{List of IEC standards #60027

IEC 60027-2

See also

References

External links