| Acronym | Meaning |
 | FTSE | Financial Times Stock Exchange (footsie) |
| FU | Smoke (METAR Code) |
| FUBAR | Fucked/Fouled Up Beyond All Recognition/Repair |
| FUCK | For |
| FUD | Fear |
| FUL | Fula Language (ISO 639-2 Code) |
| FV | Femtovolt |
| FW | Femtowatt |
| FW | Forward |
| FWC | Football World Cup |
| FWF | Fixed Word Format |
| FWI | French West Indies |
| FWIW | For What It's Worth |
| FWS | U.S. Fish And Wildlife Service |
| FWT | Fresh Water Tank |
| FX | Firefox -Metropolitan France (ISO 3166 Digram; Obsolete 1997) |
| FXX | Metropolitan France (ISO 3166 Trigram; Obsolete 1997) |
| FY | Fiscal Year -Former Yugoslav Republic Of Macedonia (NATO Country Code) |
| FY | West Frisian Language (ISO 639-1 Code) |
| FYDP | Five-Year Defense Plan (U.S.) |
| FYI | For Your Information |
| FYROM | Former Yugoslav Republic Of Macedonia |
| FZDZ | Freezing Drizzle (METAR Code) |
| FZFG | Freezing Fog (METAR Code) |
| FZRA | Freezing Rain (METAR Code) |
| FI | F?d?ration ?questre Internationale (French International Federation For Equestrian Sports) |
| G | CSF -Granulocyte Colony-Stimulating Factor |
| G | Gauss |
| G | Gram |
| G1 | Assistant Chief-of-Staff |
| G10 | Group Of 10 (G7 + Belgium |
| G15 | Group Of 15 (subset Of G77 |
| G2 | Assistant Chief-of-Staff |
| G20 | Group Of 20 (G8 + Argentina |
| G24 | Group Of 24 (subset Of G77 |
| G3 | Many |
| G4 | Generation Four PowerPC Microprocessor -Assistant Chief-of-Staff |
| G5 | Generation Five PowerPC Microprocessor -Assistant Chief-of-Staff |
| G6 | Assistant Chief-of-Staff |
| G7 | Assistant Chief-of-Staff |
| G77 | Group Of 77 (issued From The United Nations Conference On Commerce And Development |
| G8 | Assistant Chief-of-Staff |
| G9 | Assistant Chief-of-Staff |
| GA | Gabon (ISO 3166 Digram) - The Gambia (FIPS 10-4 Country Code) - Georgia (postal Symbol) - Gigaampere |
| GA | Gallium - Gigaannum |
| GA | Irish Language (ISO 639-1 Code) |
| GAAR | General Anti-Avoidance Rule (tax Evasion) |
| GAB | Gabon (ISO 3166 Trigram) |
| GABA | Gamma-AminoButyric Acid |
| GAD | Generalized Anxiety Disorder |
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