| Acronym | Meaning |
 | TSEC | Transmission Security Encryption Code |
| IDF | Israel Defence Forces - Intel Development Forum - International Dairy Federation |
| FLIR | Forward Looking InfraRed (sensor) |
| OBSS | Off Board Sensor Systems - Ordo Byantinus Sancti Sepulchri (Byzantine Order Of The Holy Sepulchre) - Orbiter Boom Sensor System (space Shuttle) - Origins Billion Star Survey |
| SIW | Simulation Interoperability Workshop |
| AM | Many |
| FIR | Final Inspection Report |
| KL | Kalaallisut Language (ISO 639-1 Code) |
| SHRA | Rain Showers (METAR Code) |
| NET | National Educational Television |
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