In the ECE system, countries that grant approvals for vehicle components, such as lighting, are identified by a specific country number. This number is displayed on the approval marking of the product. Here are some of the most common numbers used to indicate the countries where approval has taken place:

E1 - Germany E2 - France E3 - Italy E4 - Netherlands E5 - Sweden E6 - Belgium E7 - Hungary E8 - Czech Republic E9 - Spain E10 - Yugoslavia (former) E11 - United Kingdom E12 - Austria E13 - Luxembourg E14 - Switzerland E16 - Norway E17 - Finland E18 - Denmark E19 - Romania E20 - Poland E21 - Portugal E22 - Russia E23 - Greece E24 - Ireland E25 - Croatia E26 - Slovenia E27 - Slovakia E28 - Belarus E29 - Estonia E31 - Bosnia and Herzegovina E32 - Latvia E34 - Bulgaria E36 - Lithuania E37 - Turkey E39 - Azerbaijan E40 - Macedonia E42 - European Committee E43 - Japan E45 - Australia E46 - Ukraine E47 - South Africa E48 - New Zealand E49 - Cyprus E50 - Malta E51 - South Korea E52 - Malaysia E53 - Thailand E56 - Montenegro E58 - Tunisia E62 - Egypt

These ECE numbers are displayed on products, along with other approval information, to indicate the origin of the approval.