A DUNS number is a unique nine-digit identifier for a business created by credit bureau Dun & Bradstreet. Dun & Bradstreet is one of the three major business credit bureaus. DUNS numbers have become the standard numbering system to identify businesses across the globe. You can check your company's DUNS number, or request one if you do not yet have it, at https://www.dnb.com/
An EORI number means an identification number, unique in the customs territory of the European Union, assigned by a customs authority to an economic operator or to another person in order to register him for customs purposes.
The Legal Entity Identifier (LEI) is a unique global identifier for legal entities participating in financial transactions. Also known as an LEI code or LEI number, its purpose is to help identify legal entities on a globally accessible database.