| Acronym | Meaning |
 | LLAD | Low Level Air Defence |
| YH | Yottahenry |
| OBS | Observation/Observer - Obsolete - Obstacle -Off Balance Sheet - Optical Burst Switching (IEEE) - Organic Brain Syndrome - Organization(al) Breakdown Structure |
| TM | Technical Manual - Theatre Missile - Thematic Mapper -trademark (often Written In Small Superscript Type: TM Or ?) -Turing Machine -Turkmenistan (ISO 3166 Digram) |
| EHF | Extremely High Frequency |
| SMR | San Marino (ISO 3166 Trigram) |
| PDG | President Director General - Product Development Group |
| PEST | UK Public Engagement With Science And Technology |
| MDV | Maldives (ISO 3166 Trigram) |
| CATS | Computer Active Technology Suspension |
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