| Acronym | Meaning |
| SIIT | Saskatchewan Indian Institute Of Technologies (Canadian University) - Sirindhorn International Institute Of Technology (Thai University) - Stateless IP/ICMP Translation Algorithm |
| QFE | Quoted For Emphasis -Local Ground Level Atmospheric Pressure (aeronautical Q Code) |
| IUSS | Integrated Undersea Surveillance System - Integrated Unit Simulation System - International Union Of Soil Science |
| MOSS | MObile Submarine Simulator -Moving Object Support System |
| MARC | MAchine Readable Cataloging (often Also Defined As MAchine Readable Code) |
| AAIS | Advanced Airborne Interceptor Simulator |
| AKDT | Alaska Standard Daylight Saving Time (UTC-8 Hours) |
| COEIA | Combined Operational Effectiveness And Investment Appraisal (military) |
| LJJ | Lord Justices Of Appeal |
| DPDT | Double-Pole Double-Throw |