| 0 | National Association of Convenience Stores |
| 1 | Global Product Classification Code (GPC) |
| 2 | Dun's SIC 2+2, Dun & Bradstreet |
| 3 | Empty Non-hazardous Last Contained (HMRC) Code |
| 4 | Chemical Abstract Service Registry Number |
| 5 | National Drug Code |
| 6 | Universal Descriptor Exchange Code (UDEX) |
| 7 | International Foodservice Distributors Association (IFDA) |
| 8 | Manufacturer Code |
| 9 | Contractee Code |
| A | Harmonized Tariff Schedule of the United States Annotated Classification of imported merchandise for rate of duty and statistical purposes |
| AH | American Hospital Formulary System (AHFS) Classification Code |
| AT | Anatomical Therapeutic Chemical (ATC) |
| B | U.S. Foreign Trade Schedule B, Statistical Classification of Domestic and Foreign Commodities Exported from the United States |
| C | Canadian Freight Classification |
| D | Department of Defense Unique Codes |
| E | Coordinated Motor Freight Classification |
| EN | ECCnet Classification Code |
| ET | ETIM Technical Information Model (ETIM International) |
| F | National Stock Number |
| G | Canadian Wheat Board, Grain Code for Terminal Elevator Accounting |
| H | Brussels Nomenclature |
| I | Milstamp AITC or Water Commodity Code |
| J | Harmonized System-Based Schedule B Classification of exported merchandise |
| K | Federal Supply Classification |
| L | Last Contained Contents STCC |
| M | Dun & Bradstreet Standard Product and Service Code |
| N | National Motor Freight Classification (NMFC) |
| P | Bulk Petroleum Codes |
| Q | Quota Category |
| R | North American Industrial Classification System (NAICS) Code |
| S | Standard International Trade Classification (SITC) |
| T | Standard Transportation Commodity Code (STCC) |
| U | Uniform Freight Classification (UFC) |
| UN | UNSPSC - United Nations Standard Products and Services Code |
| V | Standard Industrial Classification (SIC) Code |
| W | Department of Defense Commodities and Services Code |
| X | Contractor Code |
| Y | Canadian Export Classification Also known as the Harmonized Code System (Canada) |
| Z | Mutually defined |