| Acronym | Meaning |
 | ORR | Oak Ridge Reservation (U.S. DOE) - Office Of Rail Regulation (UK Government) - Office Of Refugee Resettlement - (CIA) Office Of Research And Reports - Operational Readiness Rate - Operational Readiness Review |
| LU | Loonatics Unleashed |
| MLS | Major League Soccer -Multiple Listing Service |
| NAWC | U.S. Naval Air Warfare Center |
| MLB | Major League Baseball |
| GUJ | Gujarati Language (ISO 639-2 Code) |
| GL | Gigalitre -Graphics Language -Greenland (ISO 3166 Digram; FIPS 10-4 Territory Code) -Grenade Launcher |
| PL | Polish Language (ISO 639-1 Code) |
| BRIMS | Behavior Representation In Modeling And Simulation (conference) |
| VAO | Vienna Art Orchestra |
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