EC Number or (ECN?) 1 : A reference number used by the European Communities to identify dangerous substances, in particular those registered under EINECS
Ministry of Development, Industry and Foreign Trade, Definitions and Abbreviations, GHS (Globally Harmonized System of Classification and Labelling of Chemicals) Brazil, http://www.desenvolvimento.gov.br/arquivos/dwnl_11 97483901.pdf, (Globally Harmonized Sys of Class and Labl of Chem - Brit) {634}