Multilingual is a controlled vocabulary that lists concepts associated with cataloguing to support activities rellated to the publication process. The concepts included are correlated with the need to identify different multilingual language combinations. The EU publications use two-character codes, the first two positions of the three-character controlled vocabulary. The codes are alphanumeric in order to avoid confusion with ISO language codes, which are strictly alphabetical. Multilingual is maintained by the Publications Office of the European Union and disseminated on the EU Vocabularies website.