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| Subject | English | Thesaurus |
| O&G, abbr. | CO2 fixed type extinguishing system | CO2 |
| avia., amer. | DF fix | The geographical location of an aircraft obtained by one or more DF |
| progr., abbr. | Fixed Length Mask | FLM |
| mil., abbr. | Fixed Satellite Services | FSS |
| Nasdaq, abbr. | Perma Fix Environmental Services | PESI |
| IT, abbr. | Program Temporary Fix | PTF (IBM) |
| comp., abbr. | Program Temporary Fix | PTF |