| Acronym | Meaning |
 | EI | Ireland (FIPS 10-4 Country Code; From ire) |
| CUPE | Canadian Union Of Public Employees (CUE-pee) |
| BIF | Burundian Franc (ISO 4217 Currency Code) |
| SPACECOM | (U.S.) Space Command |
| FR | France (FIPS 10-4 Country Code; ISO 3166 Digram) |
| DMZ | DeMilitarized Zone |
| VTEC | Variable Valve Timing And Electronic Lift Control |
| RPO | Radiation Protection Officer |
| O | Oberst - Observer - Obstacle - Octal - Officer - Official - Oh - Operational - Operator - Oprah (magazine) - Outstanding -Oxygen |
| PLAF | Product Line Architecture Framework |
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