| Acronym | Meaning |
| GUI | Graphical User Interface (goo-ey) |
| MHLW | Mean Higher Low Water (nautical Charts) |
| SIMM | Single In-line Memory Module |
| O | Oberst - Observer - Obstacle - Octal - Officer - Official - Oh - Operational - Operator - Oprah (magazine) - Outstanding -Oxygen |
| AVRE | Armoured Vehicle Royal Engineers |
| FFR | Fédération Française De Rugby (French Rugby Federation) |
| FAASV | Field Artillery Ammunition Supply Vehicle |
| SST | SuperSonic Transport -Training Submarine (US Navy Hull Classification) - Saturated Suction Temperature (refrigeration Cycles) |
| TF | French Southern Territories (ISO 3166 Digram) -Task Force -Terafarad |
| GEV | Ground Effect Vehicle |