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 Electrotechnical Commission (IEC).
It serves as a style guide for the use of physical quantities and units of measurement, formulas involving them, and their corresponding units, in scientific and educational documents for worldwide use.
The ISO/IEC 80000 family of standards was completed with the publication of Part 1 in November 2009.[1]
As of 2021[update], ISO/IEC 80000 comprises 13 parts, two of which (parts 6 and 13) were developed by IEC and the remaining 11 were developed by ISO, with a further three parts (15, 16 and 17) under development. Part 14 was withdrawn.
ISO 80000-1:2009 replaces ISO 31-0:1992 and ISO 1000:1992.[21] It gives general information and definitions concerning quantities, systems of quantities, units, quantity and unit symbols, and coherent unit systems, especially the International System of Quantities (ISQ) and the International System of Units (SI).[2] The text of the informative sections of this document is publicly available.[21]
ISO 80000-2:2019 revises ISO 80000-2:2009,[3] which superseded ISO 31-11.[22]It specifies mathematical symbols, explains their meanings, and gives verbal equivalents and applications. The text of the informative sections of this document is publicly available.[23]