| Acronym | Meaning |
 | TO | Tongan Language (ISO 639-1 Code) |
| RUS | Russian Language (ISO 639-2 Code) |
| HY | Armenian Language (ISO 639-1 Code) |
| OBS | Observation/Observer - Obsolete - Obstacle -Off Balance Sheet - Optical Burst Switching (IEEE) - Organic Brain Syndrome - Organization(al) Breakdown Structure |
| SQ | Albanian Language (ISO 639-1 Code) |
| HCSC | Higher Command And Staff Course |
| UDTS | Uppsala-DLR Trojan Survey |
| POR | Proposed Operational Requirement |
| EMD | Electro-Motive Diesel - Engineering And Manufacturing Development - European Missile Defence |
| SUR | Suriname (ISO 3166 Trigram) |
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