Example image of eyePlorer eyePlorer map for 'Numbering scheme': Nominal number Database design Database management system Table (database) Unique key Address (geography) Arlington County, Virginia, street-naming system CAS registry number Country code E.164 EC number Enzyme Global Location Number Great Britain road numbering scheme GS1 International Telecommunication Union Internet Assigned Numbers Authority IP address Telephone Telephone numbers in Argentina Telephone numbers in Australia Telephone numbers in China Telephone numbers in France Telephone numbers in Hong Kong Telephone numbers in Japan Telephone numbers in Singapore Telephone numbers in the United Kingdom UN number X.121 X.25 API well number Barcode British carriage and wagon numbering and classification British Rail locomotive and multiple unit numbering and classification Det Centrale Personregister Dewey Decimal Classification Disease European Article Number Global Trade Item Number International Statistical Classification of Diseases and Related Health Problems MAC address National Insurance Oil and gas Oil well Permanent account number Personal identification number (Denmark) Personal Public Service Number Social Insurance Number Social Security number Unique Master Citizen Number