IEC 60027 (formerly IEC 27) is a

technical Technical may refer to: * Technical (vehicle), an improvised fighting vehicle * Technical area, an area which a manager, other coaching personnel, and substitutes are allowed to occupy during a football match * Technical advisor, a person who ...

international standard An 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 O ...

for letter symbols published by the

International Electrotechnical Commission The International Electrotechnical Commission (IEC; ) is an international standards organization that prepares and publishes international standards for all electrical, electronics, electronic and related technologies. IEC standards cover a va ...

(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 u ...

and

units Unit may refer to: General measurement * Unit of measurement, a definite magnitude of a physical quantity, defined and adopted by convention or by law **International System of Units (SI), modern form of the metric system **English units, histo ...

ISO 31 ISO 31 (Physical quantity, Quantities and Physical unit, units, International Organization for Standardization, 1992) is a superseded international standard concerning physical quantities, units of measurement, their interrelationships and their pr ...

. 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/IEC 80000, ''Quantities and units'', is an international standard describing the International System of Quantities (ISQ). It was developed and promulgated jointly by the International Organization for Standardization (ISO) and the Intern ...

, 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 that indicates a multiple of a unit of measurement by an integer power of two. The most commonly used binary prefixes are kibi (symbol Ki, meaning ), mebi (), and gibi (). They are most often used in inform ...

es, as proposed by

(IEC) since 1996 (''

kibi Kibi may refer to: * kibi (binary prefix), an ISO/IEC standard binary prefix for units of digital information * Kibi District, Okayama (吉備郡; -gun), a district in Okayama Prefecture, Japan * Kibi, Wakayama (吉備町), a town in District, Wak ...

-'' (Ki), ''

mebi A binary prefix is a unit prefix that indicates a multiple of a unit of measurement by an integer power of two. The most commonly used binary prefixes are kibi (symbol Ki, meaning ), mebi (), and gibi (). They are most often used in informat ...

-'' (Mi), ''

gibi A binary prefix is a unit prefix that indicates a multiple of a unit of measurement by an integer power of two. The most commonly used binary prefixes are kibi (symbol Ki, meaning ), mebi (), and gibi (). They are most often used in informat ...

-'' (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 that indicates a multiple of a unit of measurement by an integer power of two. The most commonly used binary prefixes are kibi (symbol Ki, meaning ), mebi (), and gibi (). They are most often used in informat ...

'' (Zi) and ''

yobi- A binary prefix is a unit prefix that indicates a multiple of a unit of measurement by an integer power of two. The most commonly used binary prefixes are kibi (symbol Ki, meaning ), mebi (), and gibi (). They are most often used in informat ...

'' (Yi). The harmonized

ISO The International Organization for Standardization (ISO ; ; ) is an independent, non-governmental, international standard development organization composed of representatives from the national standards organizations of member countries. Me ...

IEC The International Electrotechnical Commission (IEC; ) is an international standards organization that prepares and publishes international standards for all electrical, electronic and related technologies. IEC standards cover a vast range of ...

IEC 80000-13 ISO/IEC 80000, ''Quantities and units'', is an international standard describing the International System of Quantities (ISQ). It was developed and promulgated jointly by the International Organization for Standardization (ISO) and the Intern ...

: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