| Acronym | Meaning |
| TON | Tongan Language (ISO 639-2 Code) |
| FAAD | Forward Area Air Defence |
| HST | See Entry |
| ESU | Emergency Services Unit |
| VON | Victorian Order Of Nurses |
| HDD | Hard Disk Drive - High-Density Disk |
| CATS | Computer Active Technology Suspension |
| 2.5G | Second-and-a-half-generation Mobile Telephone System |
| VTEC | Variable Valve Timing And Electronic Lift Control |
| USD | (U.S.) Under-Secretary Of Defense -U.S. Dollar (ISO 4217 Currency Code) |