(The full requirements are described in the ISO/IEC Directives Part 2:2011, 6.6.9 and Annex I, i).)

The International System of units (SI) as set out in ISO 80000 and IEC 80000 shall be used. A list concerning quantities and units to be used is given for information in Annex I of the Directives.

Symbols for units are printed in Arial upright type.