| Acronym | Meaning |
| EAC | Echelons Above Corps |
| XHR | EXtra High Image Resolution - XMLHTTPRequest |
| GEOS | Graphical Environment Operating System |
| MHWS | Mean High Water Springs (nautical Charts) |
| MSIE | Microsoft Internet Explorer - Master Of Science In Industrial Engineering |
| ACINT | Acoustic Intelligence |
| PR | Public Relations -Puerto Rico (postal Symbol; ISO 3166 Digram) |
| YIPPIE | Youth International Party + Suffix |
| LRS | Long Range Surveillance |
| HFE | Human Fertilisation And Embryology (UK Act) |