| Acronym | Meaning |
| KKK | Ku Klux Klan |
| VCJD | Variant Creutzfeldt-Jakob Disease |
| IY | Iraqi-Saudi Neutral Zone (FIPS 10-4 Territory Code; Obsolete 1993) |
| GYY | Gary/Chicago International Airport (IATA Airport Code) |
| TADIL | Tactical Digital Information Link |
| GZK | Greisen-Zatsepin-Kuzmin Cut-off (cosmic Ray Energies) |
| DSPM | D.s.p. Malus (Latin |
| AEF | American Expeditionary Force |
| AY | Antarctica (FIPS 10-4 Territory Code) |
| AFS&A OR AFSA | U.S. Air Force Studies And Analysis |