| Acronym | Meaning |
 | XIX | Nineteen (in Roman Numerals) |
| AEF | American Expeditionary Force |
| COM | Comoros (ISO 3166 Trigram) -Component Object Model |
| FLK | Falkland Islands (ISO 3166 Trigram) -Funny-Looking Kid (medical Diagnosis In-joke) |
| AIAA | American Institute Of Aeronautics And Astronautics |
| NH | New Hampshire (postal Symbol) - New Hebrides (ISO 3166 Digram; Obsolete 1980) - Vanuatu (FIPS 10-4 Country Code; From New Hebrides) |
| ECBR | European Coalition For Biomedical Research |
| NIMH | National Institute Of Medical Herbalists - National Institute Of Mental Health |
| RRSP | Registered Retirement Savings Plan (Canada; Roughly Equivalent To The IRA In The U.S.) |
| MARC | MAchine Readable Cataloging (often Also Defined As MAchine Readable Code) |
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