IEC TS 62720:2017

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Relations between quantities, units and their
  systems
5 Prefixes and prefix symbols
6 Identification of units
Annex A (informative) - Information about units
Annex B (normative) - Identifiers for units and
        quantities
Annex C (informative) - Quantities and assigned
        units of measure
Bibliography

IEC TS 62720:2017(E) specifies identifiers for units to support computer-based processing of product data. It provides a survey of quantities with associated collections of internationally standardized as well as non–standardized units used in business and science.
It covers any standard or non-standard units of measure currently in use, in two or more distinct ethno-linguistic groups or nations, at least in one domain of industry, for which an explicit method of conversion to a known standard unit of measure or its equivalent is well documented or evident from external references.