NACE (Nomenclature of Economic Activities) is the European statistical classification of economic activities. It is established be law. The classification consists of an alphanumeric designation of the form DNN.N.N, where D stands for a capital letter A-Z and N are digits 0-9.
The system is hierarchical: at the highest level are broad industrial sectors such as Manufacturing or Mining which are refined at two further levels, i.e. sector, sub-sector and sub-subsector. The hierarchical levels are denoted respectively:
- Section: Level 1: 21 sections identified by alphabetical letters A to U;
- Division: Level 2: 88 divisions identified by two-digit numerical codes (01 to 99);
- Group: Level 3: 272 groups identified by three-digit numerical codes (01.1 to 99.0);
- Class: Level 4: 615 classes identified by four-digit numerical codes (01.11 to 99.00).
As an example of an economic sector, Artistic Creation would be classified as:
- R - Arts, entertainment and recreation
- R90.0 - Creative, arts and entertainment activities
- R90.0.3 - Artistic creation
Top Level NACE Sectors (Sections)
This is the NACE Rev. 2 highest level segmentation 
- Regulation (EC) No. 1893/2006 of the European Parliament and of the Council of 20 December 2006 establishing the statistical classification of economic activities NACE Revision 2 and amending Council Regulation (EEC) No. 3037/90 as well as certain EC Regulations on specific statistical domains (OJ L 393, 30.12.2006, p. 1)
- NACE Rev. 2, Statistical classification of economic activities in the European Community