Acronym for United Nations Code for Trade and Transport Locations. A five-character code system used to identify more than 40,000 trade and transport locations worldwide. These locations include ports, airports, railway, bus and truck terminals, and other pick-up and drop-off points for freight. The five character code consists of a two character country code (based on the ISO 3166 alpha-2 Country Code) and a three character code element for the location itself. While alpha characters are typical for the location itself, the numerals 2 to 9 may also be used. See www.unece.org/cefact/locode/service/main.htm for a complete listing of codes.