| Acronym | Meaning |
 | BEN | Benin (ISO 3166 Trigram) |
| FRS | Fellow Of The Royal Society - U.S. Federal Reserve System |
| FM | Fermium |
| DHY | Dahomey (ISO 3166 Trigram; Became BEN In 1977) |
| NCO | Non-Commissioned Officer |
| OM | Oman (ISO 3166 Digram) |
| NAIRU | Non Accelerating Inflation Rate Of Unemployment |
| ISO | In Search Of -International Organization For Standardization (from The Greek ?†?? |
| IY | Iraqi-Saudi Neutral Zone (FIPS 10-4 Territory Code; Obsolete 1993) |
| SSN | Nuclear-Powered Attack Submarine (US Navy Hull Classification) -SIM Serial Number - Social Security Number - Socialist Solidarity Network - Subsystem Number (SCCP |
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