# List of acronyms: F

This list contains acronyms, initialisms, and pseudo-blends that begin with the letter F.
For the purposes of this list:
* acronym = an abbreviation pronounced as if it were a word, e.g., SARS = severe acute respiratory syndrome, pronounced to rhyme with cars
* initialism = an abbreviation pronounced wholly or partly using the names of its constituent letters, e.g., CD = compact disc, pronounced cee dee
* pseudo-blend = an abbreviation whose extra or omitted letters mean that it cannot stand as a true acronym, initialism, or portmanteau (a word formed by combining two or more words).
    (a) = acronym, e.g.: SARS – (a) severe acute respiratory syndrome
    (i) = initialism, e.g.: CD – (i) compact disc
    (p) = pseudo-blend, e.g.: UNIFEM – (p) United Nations Development Fund for Women
    (s) = symbol (none of the above, representing and pronounced as something else; for example: MHz – megahertz)
Some terms are spoken as either acronym or initialism, e.g., VoIP, pronounced both as voyp and V-O-I-P.
(Main list of acronyms)

## Contents

* Top
* F0–9 FA FB FC FD FE FF FG FH FI FJ FK FL FM FN FO FP FQ FR FS FT FU FV FW FX FY FZ
* f – (s) Femto
* F – (s) Farad – Fluorine

## FA

* fa – (s) Persian language (ISO 639-1 code)
* FA – Food Addicts in Recovery Anonymous
* fA – (s) Femtoampere
* FA
** (i) Field Artillery
** Financial aid
** Football Association (England)
** Football Australia (governing body for association football)
** Forever Alone (Internet slang for “single”)
* FAA
** (i) U.S. Federal Aviation Administration
** Financial Aid Administrator
** Fleet Air Arm
** Functional Area Analysis
* FAAD – (a) Forward Area Air Defence
* FAADEZ – (i) Forward Area Air Defence Engagement Zone
* FAAN – (i) Fellow of the American Academy of Neurology
* FAAFP – (i)Fellow of the American Academy of Family Physicians
* FAAN – (i) Fellow of the American Academy of Nursing
* FAANG – Facebook, Amazon, Apple, Netflix, Google (the leading stocks in the late-2010s US market rally) (c.f. FANG, which originally did not include Apple)
* FAAQ – (a/i) Frequently Asked and Anticipated Questions (cf. FAQ)
* FAASV – (i) Field Artillery Ammunition Supply Vehicle
* FAB – (i) Feline Advisory Bureau (UK feline charity)
* FACF - Fully Automatic Capsule Filler source
** (i) Forward Air Controller
** Front of Allies for Change
** Frontal Affinity Chromatography
** Full Aperture Calibrator
* FACA – (a) (US) Federal Advisory Committee Act
* FACH – (a) Fuerza Aérea de Chile
* FACN – (i) Fellow of the American College of Nutrition
* FACP – (i) Fellow of the American College of Physicians
* FACS
** (i) Fellow of the American College of Surgeons
** (a) Formal Aspects of Computing Science
** Fluorescent-activated cell sorting
* FACTS – (a) Flexible Alternating Current Transmission System
* FAD
** (i) Flavin Adenine Dinucleotide
** (a) Funding Authorization Document
* M18 FADAC – (p) Field Artillery Data Computer
* FADEC - (a) Full Authority Digital Engine (or Electronic) Control
* FAFSA – (a) Free Application for Federal Student Aid (US)
* FAH
** (i) Federation of American Hospitals
** Fine Arts and Humanities
** Foreign Affairs Handbook
* FAI
** (i) Fédération Aéronautique Internationale (French, "International Aeronautics Federation")
** Football Association of Ireland
* FAL - (a) Fusil Automatique Léger (French, Light Automatic Rifle), Belgian battle rifle
* FAM – (i) Foreign Affairs Manual
* fao – (s) Faroese language (ISO 639-2 code)
* FAO – (i) Food and Agriculture Organization
* FAPA – Fellow of the American Psychological Association
* FAPHA – Fellow of the American Public Health Association
* FAQ – (a/i) Frequently Asked Questions (sometimes pronounced "fak")
* FARC – (a) Fuerzas Armadas Revolucionarias de Colombia (Spanish, "Revolutionary Armed Forces of Colombia")
* FARDC – (a) "Military of the Democratic Republic of the Congo
* FARP – (a) Forward Arming and Refuelling Point / Forward Area Rearm/refuel Point
* fas – (s) Persian language (ISO 639-2 code)
* FAS
** (i) Federation of American Scientists
** Fetal Alcohol Syndrome
* FASCAM – (p) Family of Scatterable Mines
* FASD – (i) Fetal Alcohol Spectrum Disorder
* FASEB – (a/i) Federation of American Societies for Experimental Biology
* FAST
** (a) Face, Arm, Speech, Time (stroke symptoms)
** Five hundred meter Aperture Spherical Telescope (Chinese radio telescope)
** Fixing America's Surface Transportation Act (U.S. legislation)
* FAT – (a) Field Artillery Tractor – File Allocation Table
* FAVS – (a) Future Armoured Vehicle System
* FAW
** (i) Football Association of Wales
** First Automobile Works (Chinese automobile manufacturer)

## FB

* FB – Facebook, An on-line social network
* FBCB2 or FBCB$^2$ – (p) Force XXI Battle Command, Brigade-and-Below
* FBCS – (i) Fellow of the British Computer Society
* FBI – (i) Federal Bureau of Investigation
* FBIS – (i) Foreign Broadcast Information Service
* FBIDST – (i) Fellow of the British Institute of Dental and Surgical Technologists
* FBLA (i) Future Business Leaders of America {Jr & HS Group}
* FBM – (s) Board foot
* FBR
** (i) Fast Breeder Reactor
** Foundation for Biomedical Research
** Friedman, Billings, Ramsey (now known as Arlington Asset Investment)
* FBS
** Federal Bureau of Statistics (Pakistan)
** Fetal bovine serum
** Football Bowl Subdivision (U.S. college football)
** Fukuoka Broadcasting Corporation

## FC

* fC – (s) Femtocoulomb
* FC
** (i) Fire Control
** Football Club
** (s) Funnel Cloud (METAR Code)
* FCA
** (i) Fellowship of Christian Athletes
** Fiat Chrysler Automobiles
** Fraction of Combat Active forces
* FCC – (i) U.S. Federal Communications Commission
* FCE – (i) First Certificate in English
* FCF – (i) Financial Free Cash Flow
* FCFS – (i) First Come, First Served
* FCLA – Fraud Claims Law Associate
* FCM
** (i) Federation of Canadian Municipalities
** Fogarty's Cove Music
* FCO – (i) UK Foreign and Commonwealth Office
* FCS
** (i) Football Championship Subdivision (U.S. college football)
** Future Combat System
* FCSB – (i) Fotbal Club Steaua București, a name claimed by two association football clubs in Bucharest – FCSB and CSA Steaua București
* FCW – (i) Florida Championship Wrestling
** FCW - Forward Collision Warning, see Collision avoidance system
* FCZ – (i) Forward Combat Zone

## FD

* FD – (i) Falun Dafa
* FDA – (i) Food and Drug Administration (U.S.)
* FDBK – (i) Feedback
* FDC
** (i) Federal Detention Center (U.S.)
** Fire Direction Centre
* FDDI – (i) Fibre Distributed Data Interface
* FdI – (i) Fratelli d'Italia (Italian, "Brothers of Italy"), an Italian political party
* FDI
** (i) Fault detection and isolation
** Films Division of India, a government film production agency
** Flexible Display Interface
** Foreign direct investment
** Frégate de défense et d'intervention (French, "Defense and Intervention Frigate"), a planned class of French Navy ships
* FDNY – Fire Department of New York
* FDR
** (i) Flight data recorder
** Franklin Delano Roosevelt

## FE

* Fe – (s) Iron (Latin Ferrum)
* FE – (i) Fully Exposed (armoured vehicle target, as opposed to Hull-Down)
* FEAR
** (a) First Encounter Assault Recon
** False Evidence Appears Real
** Focus sash Endeavor (Quick) Attack Rattata (or Fucking Evil Annoying Rodent), a last-resort tactic in competitive Pokemon battling
* FEAST – (a/i) Forum for European-Australian Science and Technology Cooperation
* FEATS – (a) Festival of European Anglophone Theatrical Societies
* FEB
** (i) Federación Española de Baloncesto (Spanish, "Spanish Basketball Federation")
** Federatie Eredivisie Basketball (Dutch, "Federation Honorary Division (of) Basketball"), the former name of the basketball competition later known in Dutch by the English-language Dutch Basketball League
** Força Expedicionária Brasileira (Portuguese, "Brazilian Expeditionary Force")
* FEBA – (a) Forward Edge of the Battle Area
* fec. – (p) fecit (Latin, "he made it")
* FED – (a/i) Field emission display
* FEDEP – (p) Federation Development Process (Simulation)
* FEF – (i) Frontal Eye Field (neurophysiology)
* FEI – (i) Fédération équestre internationale (French, "International Federation for Equestrian Sports")
* FEMA
** (a/i) Farm Equipment Manufacturers Association
** (a/i) U.S. Federal Emergency Management Agency
* FEMEXFUT – (p) Federación Mexicana de Fútbol Asociación (Spanish, "Mexican Association Football Federation")
* FENAFUTH – (p) Federación Nacional Autónoma de Fútbol de Honduras (Spanish, "National Autonomous Football Federation of Honduras")
* FENS – (a/i) Federation of European Neuroscience Societies
* FEP – (i) Firepower Enhancement Program – Fleet satellite (FLTSAT) Extremely high frequency (EHF) Package
* FEPAFUT – (p) Federación Panameña de Fútbol (Spanish, "Panamanian Football Federation")
* FES – (i) Flywheel Energy Storage
* FEST – (a) Frankfurt English Speaking Theatre
* FET – (a) Field-effect transistor
* FEZ – (a/i) Fighter Engagement Zone

## FF

* ff – (s) Fula language (ISO 639-1 code)
* fF – (s) Femtofarad
* FF
** (i) Final Fantasy
** (p) Firefox (Web browser)
* FFA
** (i) Football Federation Australia, former name of the governing body now known as Football Australia
** Pacific Islands Forum Fisheries Agency
** Free-Fire Area
** Fusiform Face Area
** Future Farmers of America (today the National FFA Organization)
* FFB – (i) Frum From Birth (referring to an observant Jew born into a religiously observant family)
* FFC – (i) Free For Chat
* FFCM — Fellow of the Faculty of Community Medicine (fellowship created in 1972, now replaced by FFPH)
* FFE – (i) Fukuoka Futures Exchange
* FFF – (i) Fédération française de football (French, "French Football Federation")
* FFG – (s) Guided Missile Frigate (hull classification symbol)
* FFOV – (i) Forward Field Of View
* FFP - (i) Federally Funded Participation
* FFPH — Fellow of the Faculty of Public Health, replacing FFPHM
* FFR – (i) Fédération française de rugby (French, "French Rugby (Union) Federation")
* FFS – (i) For Fuck's Sake
* FFT
** (i) Fast Fourier transform
** Final Fantasy Tactics

## FG

* FG – (i) Falun Gong
* fg – (s) Femtogram
* FG – (s) Fog (METAR Code) – French Guiana (FIPS 10-4 territory code)
* FGR – (a) Flickr Group Roulette

## FH

* fH – (s) Femtohenry
* FHFIF – (i) Foster's Home for Imaginary Friends
* FHI – (i) Family Health International, Fuji Heavy Industries, Ltd.

## FI

* fi – (s) Finnish language (ISO 639-1 code)
* FI – (s) Finland (ISO 3166 digram; FIPS 10-4 country code)
* FIA – (a) Fédération internationale de l'automobile (French "International Automobile Federation")
* FIAT – (a) Fabbrica Italiana Automobili Torino (Italian "Italian Car Factory of Turin")
* FIB – (a) Fucking Illinois Bastard (Wisconsin slang, variants exist)
* FIBA – originally (a) Fédération internationale de basket-ball amateur (French, "International Amateur Basketball Federation"); since 1989, (p) Fédération internationale de basket-ball
* FIBUA – (i/a) Fighting In Built-Up Areas
* FIC – (i) Fellowship for Intentional Community
* FID – (i) Foreign Internal Defence
* FIDÉ – (a) Fédération internationale des échecs (French, "World Chess Federation")
* FIE – (i) Fly-In Echelon
* FIFA – (a) Fédération internationale de football association (French, "International Association Football Federation")
* FIFe – (a) Fédération internationale féline (French, "International Feline Federation")
* FIFO – (a) First In, First Out
* FIFRA – (a) Federal Insecticide, Fungicide, and Rodenticide Act
* FIG
** (i) Fédération internationale des géomètres (French, "International Federation of Surveyors")
** Fédération internationale de gymnastique (French, "International Federation of Gymnastics")
** Feminist Improvising Group (music ensemble)
* FIGJAM – (a) Fuck I'm Good, Just Ask Me
* fij – (s) Fijian language (ISO 639-2 code)
* FILA – (a) Fédération internationale des luttes associées (French, "International Federation of Associated Wrestling Styles"), former name of the sport governing body now known as United World Wrestling
* FILO – (a) First In, Last Out (see also LIFO)
* FIMPT – (i) Fellow of the Institute of Maxillofacial Prosthetists and Technologists
* fin – (s) Finnish language (ISO 639-2 code)
* FIN – (s) Finland (ISO 3166 trigram)
* FINA – (p/a) Fédération internationale de natation (French, "International Swimming Federation")
* FIPS – (a) Federal Information Processing Standard
* FIR
** (i) Final Inspection Report
** Federazione Italiana Rugby (Italian, "Italian Rugby (Union) Federation")
* FIRES – Fever Induced Refractory Epilepsy Syndrome or Febrile Infection-Related Epilepsy Syndrome
* FIS – (a/i) Fédération internationale de ski (French "International Ski Federation")
* FISA – (a) Fédération Internationale des Sociétés d'Aviron (French, "International Federation of Rowing Associations")
* FISH – (a) Fluorescence In-Situ Hybridisation
* FiST – (p) Fire Support Team
* FITS – (a) Flexible Image Transport System
* FIU – (i) Florida International University

## FJ

* fj – (s) Fijian language (ISO 639-1 code)
* fJ – (s) Femtojoule
* FJ – (s) Fiji (ISO 3166 digram; FIPS 10-4 country code)
* FJD – (s) Fiji dollar (ISO 4217 currency code)
* FJI – (s) Fiji (ISO 3166 trigram)
* FJN – (a) Financial Job Network

## FK

* fK – (s) Femtokelvin
* FK – (s) Falkland Islands (ISO 3166 digram; FIPS 10-4 territory code)
* f.k.a. or F/K/A – (i) Formerly Known As
* FKP – (s) Falkland Islands pound (ISO 4217 currency code)
* FKSM – (i) Fort Knox Supplemental Manual
* FKT – (i) Fastest Known Time

## FL

* fl – (p) floruit (Latin, "living") (genealogy)
* fL – (s) Femtolitre
* FL – (s) Florida (postal symbol)
* FLA – (p) Florida – (i) Front Line Assembly – Future Large Aircraft
* FLAC – (a/i) Free Lossless Audio Codec
* FLAC – (a/i) Free Legal Advice Centres
* FLAK – (p) FLugAbwehrKanone (German for "Anti-Aircraft Guns")
* FLB – (i) Forward Logistics Base
* FLET – (a/i) Forward Line of Enemy Troops
* FLG – (p) Falun Gong
* FLIP – (p) Flight Information Publication
* FLIR – (i) Forward Looking InfraRed (sensor)
* FLK – (s) Falkland Islands (ISO 3166 trigram)
** Also Funny-Looking Kid, a medical initialism for a young child with a mostly normal but somewhat unusual ("funny") appearance that raises the suspicion index for congenital disorder. Used only before a medical diagnosis has determined the cause of the unusual appearance.
* FLOT – (a/i) Forward Line of Own Troops
* FLSA – (i) Fair Labor Standards Act
* FLQ – (i) Front de libération du Québec (French for "Québec Liberation Front")
* FLQ – (a) Free Legal Questions
* FLTSAT – (p) Fleet Satellite
* FLTSATCOM – (p) Fleet Satellite Communication System
* FLUBOS – (a) Fat, Lazy, Useless, Bag Of Shit

## FM

* FM – (s) Factory Mutual http://fmglobal.com
* fm – (s) Femtometre
* Fm – (s) Fermium
* FM
** (i) Federal Magistrate (Australian post-nominal)
** (s) Federated States of Micronesia (postal symbol; ISO 3166 digram; FIPS 10-4 territory code)
** (i) Field Manual
** Flight Manager
** Frequency Modulation (electronics)
* FMC
** (i) Federal Magistrates' Court (an Australian federal court, formerly FMS)
** Food Machinery Corporation (original name of the company now known as FMC Corporation)
* FMCA – (i) Federal Magistrates' Court of Australia (used for citing decisions of the FMC other than family law decisions)
* FMCAfam – (i) Federal Magistrates' Court of Australia: family (used for citing family law decisions of the FMC)
* FME – (i) Formal Methods Europe
* FMECA – (i) Failure Modes and Effect Criticality Analysis
* FMJD – (i) Fédération Mondiale du Jeu de Dames
* FMLA – (i) Family Medical Leave Act
* Fmr – Former (as in "Fmr. president")
* fMRI – (i) Functional Magnetic Resonance Imaging
* FMS
** (i) Federal Magistrates Service (an Australian federal court, now FMC)
** (i) Flight Management System
** Foreign Military Sales
* FMSF – (i) False Memory Syndrome Foundation
* FMTV – (i) Family of Medium Tactical Vehicles
* FMCG – (i) Fast-Moving Consumer Goods

## FN

* fN – (s) Femtonewton
* Fabrique Nationale (Belgian firearms manufacturer)
* FNA – (i) Functional Needs Analysis
* FNaF - (a) Five Nights at Freddy’s (horror video game series)

## FO

* fo – (s) Faroese language (ISO 639-1 code)
* FO
** (s) Faroe Islands (ISO 3166 digram; FIPS 10-4 territory code)
** (i) Force Operations (military)
** Forward Observer
** Frame Optional (military symbology)
* FOAD – (a) Fuck Off And Die
* FOAF – (a) Friend Of A friend
* FoB – (i) Free On Board (shipping)
* FOB – (i/a) Forward Operating Base
* FOC
** (i) First of Class
** Forward of center (measure of weight bias of an arrow)
** Full Operational Capability
* FOD - Foreign Object Debris
* FoE
** (a/p) Federation of Earth
** (p) Friends of the Earth
* FOGC – (i) Federal Oil and Gas Council
* FOH – (a) Front Of House
* FOIA – (a) Freedom of Information Act
* FOM – (a) Federation Object Model
* FOMO – (a) Fear of missing out
* FONSI – (a) Finding of No Significant Impact
* FOO – (a) Forward Observation Officer
* FOR
** (i) Field Of Regard
** Frame Of Reference
* Fortran – (p) The IBM Mathematical FORmula TRANslating System (programming language)
* FOS
** (i) Florida Ornithological Society
** Full Operational Status
* FoS – (i) Family of Systems
* FOSE – (p) Fallout 3 Script Extender
* FOSE – (a) Federal Office Systems Expo
* FOT – (i) Free on truck
* FOTA – (i) Fellow of the Orthodontic Technicians Association
* FOTC – Flight of the Conchords
* FOUO – (i) For Official Use Only
* FOV – (i) Field Of View

## FP

* FP – (s) French Polynesia (FIPS 10-4 territory code)
* FPF
** (i) Federação Portuguesa de Futebol ("Portuguese Football Federation" in that language)
** Final Protective Fire
* fps – (s) frames per second (motion pictures, television, computer graphics)
* FPS
** (i) Fire Prevention System
** First-person shooter (computer/video games)
* FOOP – (s) Friends Of Organ Pipes (Volunteer group)

## FQ

* FQ – (s) Baker Island (FIPS 10-4 territory code) – French Southern and Antarctic Territories (ISO 3166 digram; obsolete 1979)
* FQDN – (i) Fully Qualified Domain Name

## FR

* fr – (i) For real
* fr – (s) French language (ISO 639-1 code)
* Fr – (s) Francium
* FR – (s) France (FIPS 10-4 country code; ISO 3166 digram)
* fra – (s) French language (ISO 639-2 code)
* FRA
** (i) Federal Railroad Administration
** (s) France (ISO 3166 trigram)
* FRAGO – (p) Fragmentary Order (military)
* FRAND – (a) Fair, reasonable, and non-discriminatory (concept in standards-setting and intellectual property law)
* FRCP
** (i) Federal Rules of Civil Procedure
** Fellow of the Royal College of Physicians
* FRICBM – (i) Full Range ICBM
* frr – (s) North Frisian language (ISO 639-2 code)
* FRR
** (s) Falls Road Railroad (reporting mark)
** (i) Federaţia Română de Radioamatorism (Romanian, "Romanian Amateur Radio Federation")
** (i) Fix, Rebuild, Replace
** Federaţia Română de Rugby (Romanian, "Romanian Rugby (Union) Federation")
* FRO – (s) Faroe Islands (ISO 3166 trigram)
* FRS
** (i) Fellow of the Royal Society
** U.S. Federal Reserve System
* FRSA – (i) Fellow of the Royal Society of Art
* FRSL – (i) Fellow of the Royal Society of Literature
* fry – (s) West Frisian language (ISO 639-2 code)
* FRY – (i) Federal Republic of Yugoslavia

## FS

* fs – (s) Femtosecond
* fS – (s) Femtosiemens
* FS
** (i) Fire Support (military)
** (s) French Southern and Antarctic Territories (FIPS 10-4 territory code)
* FSA
** (i) Fire Support Area
** UK Food Standards Agency
** Functional Solution Analysis
* FSB
** (i) Federal'naya Sluzhba Bezopasnosti Rossiyskoi Federatsii (Федера́льная слу́жба безопа́сности Росси́йской Федера́ции, Russian "Federal Security Service of the Russian Federation", succeeded the FSK in 1995)
** Forward Support Battalion
* FSC
** (i) Federal Supply Classification
** (a) Forest Stewardship Council (ecological pressure group)
* FSCL – (i) Fire Support Co-ordination Line
* FSE – (i) Fire Support Element
* F&SF – (i) (The Magazine of) Fantasy & Science Fiction
* FSF – (i) Free Software Foundation
* FSH – (i) Follicle-stimulating hormone
* FSI – (i) Fuel Stratified Injection
* FSK – (i) Federal'naya Sluzhba Kontrrazvedki (Федера́льная Слу́жба Контрразве́дки, Russian "Federal Counterintelligence Service", succeeded the KGB in 1991)
* FSM
** (s) Federated States of Micronesia (ISO 3166 trigram)
** (i) Flying Spaghetti Monster (satirical religion)
* FSO
** (i) Fire Support Officer
** Flotilla Staff Officer
** Foreign Service Officer
* FSS – (i) Fire Support Station
* FSSP – (i) Families of Structurally Similar Proteins
* FST
** (i) Finance Support Team
** Finlands Svenska Television (Finland's Swedish-language television)
** Future Soviet Tank (Cold War era)
* FSTC – (i) Foreign Science Technology Center (now NGIC)
* FSV
** (i) Fire Support Vehicle
** Fisheries Survey Vessel
** Flexible Sender Validation
** Fort St. Vrain
** Fußball und Sportverein (German "Football and Sport Association", as in FSV Mainz)

## FT

* fT – (s) Femtotesla
* FTC – (i) Federal Trade Commission
* FTE – (i) Full Time Equivalent
* FTHGOAC - For The Highest Good Of All Concerned
* FTL – (i) Faster Than Light
* FTP – (i) File Transfer Protocol
* FTS
** (i) Flight Termination System used during some rocket launches
** Follow-the-sun
** Fuck/Forget That/This Shit
* FTSE – (a/i) Financial Times Stock Exchange ("footsie")
* FTW – (i) For The Win (a commonly used phrase used online to indicate success), Fuck the World, Forever Together Wherever (gang slogan)

## FU

* FU – (s) Smoke (METAR Code)
* FUBAR – (a) Fucked/Fouled Up Beyond All Recognition/Repair
* f/u/b/o – (i) For the use and benefit of (found in legal documents)
* FUBU - (a) For Us, By Us
* FUCK – (a) For, Unlawful, Carnal, Knowledge (Van Halen album title)
* FUD – (a) Fear, Uncertainty & Doubt (marketing strategy)
* FUGAZI (acronym) – (a) British/American Army slang, then Video Gamer FPS slang for Fucked Up, Got Ambushed, Zipped In.
* ful – (s) Fula language (ISO 639-2 code)

## FV

* fV – (s) Femtovolt

## FW

* fW – (s) Femtowatt
* FW – (s) Forward
* F/W – (i) Fixed Wing
* FWC – (i) Football World Cup
* FWD - (a) Front Wheel Drive (automobile transmission type)
* FWF – (i) Fixed Word Format
* FWI – (i) French West Indies
* FWIW – (i) For What It's Worth
* FWS – (i) U.S. Fish and Wildlife Service
* FWT – (i) Fresh Water Tank

## FX

* FX – (a) Firefox – Fox Extended – (s) Metropolitan France (ISO 3166 digram; obsolete 1997) – Special effect
* FXX – (s) Metropolitan France (ISO 3166 trigram; obsolete 1997)

## FY

* fy – (s) West Frisian language (ISO 639-1 code)
* FY – (i) Fiscal Year – (s) Former Yugoslav Republic of Macedonia (NATO country code)
* FYA – (i) For Your Agenda
* FYDP – (i) Five-Year Defense Plan (U.S.)
* FYI – (i) For Your Information
* FYI&A – (i) For Your Information and Action
* FYROM – (a) Former Yugoslav Republic of Macedonia, currently North Macedonia

## FZ

* FZDZ – (s) Freezing Drizzle (METAR Code)
* FZFG – (s) Freezing Fog (METAR Code)
* FZRA – (s) Freezing Rain (METAR Code)