| Acronym | Meaning |
 | ERA | Earned Run Average - Engineering Research Associates - Equal Rights Amendment - English Racing Automobiles - European Railway Agency |
| TY | Tahitian Language (ISO 639-1 Code) |
| OSCE | Organisation For Security And Cooperation In Europe |
| RWADA | Resident Weighted Average Daily Attendance (New York State Term Used In Public Education To Indicate The Size Of A School District |
| MGS | Mobile Gun System |
| EKG | Electrocardiogram (from German Elektrokardiogramm) |
| HIH | His (or Her) Imperial Highness |
| TA | Target Acquisition - Teaching Assistant -Tera-ampere -Territorial Army (UK) -Tristan Da Cunha (ISO 3166 Digram) |
| LEMOSS | Long-Endurance MObile Submarine Simulator |
| VACIS | Vehicle And Container Inspection System |
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