ISO/IEC 80000
International standard ISO 80000 or IEC 80000—depending on which of the two international standards bodies International Organization for Standardization and International Electrotechnical Commission is in charge of each respective part—is a style guide for the use of physical quantities and units of measurement, and formulas involving them, in scientific and educational documents worldwide. In most countries, the notations used in mathematics and science textbooks at schools and universities follow closely the guidelines given by this standard.
The ISO/IEC 80000 family of standards was completed with the publication of Part 1 in November 2009. The introduction to Part 1 states 'The system of quantities, including the relations among them the quantities used as the basis of the units of the SI, is named the International System of Quantities, denoted “ISQ”, in all languages.'
Read more about ISO/IEC 80000: Parts, IEC TC 25, Binary Prefixes