3.2 Abbreviated terms
| CDD | IEC Common Data Dictionary |
| CGS | Centimetre–Gram–Second system of units |
| DA | Data Access |
| EU | Engineering Unit |
| IRDI | International Registration Data Identifiers defined in ISO/IEC 11179-6 |
| ISQ | International System of Quantities (ISO/IEC 80000) |
| NaN | “Not a Number” defined in IEEE 754 |
| UA | Unified Architecture |
| UCUM | Unified Code for Units of Measure, see https://ucum.org |
| UNECE | United Nations Economic Commission for Europe |