| HAJ | Hokkaido Arbeit Johosha (Japanese publishing company) |
| HAJ | Hanover, Germany - Langenhagen (Airport Code) |
| HAJ | Honor and Justice (MMORPG Utopia alliance) |
| HAJ | Himalayan Association of Japan (mountaineering) |
| HAJ | Housing Authority of Joliet (Joliet, IL) |
| HAJ | Hobby Association of Japan |
| |
| OOC | Out of Character (online role-playing) |
| OOC | Out of Class (various organizations) |
| OOC | Out-Of-Character (gaming) |
| OOC | Out Of Control |
| OOC | Outfit of Choice (pageants) |
| OOC | Order of Creation (theology) |
| OOC | Out of Committee (various locations) |
| OOC | Out of Camera (photography) |
| OOC | Office of Citizenship (US CIS) |
| OOC | Out of Curiosity |
| OOC | Optical (WDM) Overhead Channel |
| OOC | Out of Core |
| OOC | Original or Copy |
| OOC | Out of Character |
| OOC | Office of Counsel (US Navy) |
| OOC | Out of Context |
| OOC | Out-Of-Conference |
| OOC | Oman Oil Company |
| OOC | Out of Course (Singapore Armed Forces) |
| OOC | oil on canvas (type of painting) |
| OOC | Osaka Organic Chemical Industry Ltd. (Japan) |
| OOC | Office of Compliance (various organizations) |
| OOC | Out-Of-Commission |
| OOC | Out of Country |
| OOC | Office of the Chairman |
| OOC | Out of Coffee |
| OOC | Orlando Opera Company (est. 1958; Orlando, FL) |
| OOC | Optical Orthogonal Code |
| OOC | Out of Contract |
| OOC | Out of Clan (gaming) |
| OOC | Out of Calibration |
| OOC | Out of Cycle |
| OOC | Out of Concentration (Dark Age of Camelot online game) |
| OOC | Oil on Cuttings |
| OOC | Officer of Cadets (Australian Defence Forces) |
| OOC | Operational Oceanography Center |
| OOC | Object-Oriented COBOL |
| OOC | Out of Code |
| OOC | Other Operating Costs (financial management) |
| OOC | Originating Office Control |
| OOC | Olympics Organizing Committee |
| OOC | Orders-on-Contract |
| |
| FFU | For Future Use |
| FFU | Final Fantasy Unlimited (Anime) |
| FFU | Fit for Use |
| FFU | Filter Fan Unit (cleanliness) |
| FFU | Forschungsstelle für Umweltpolitik (Environmental Policy Research Unit, Free University of Berlin) |
| FFU | Fast File Undelete |
| FFU | Fan Filter Unit (cleanrooms) |
| FFU | Feriening Frysk Underwiis (German; Frisian education association; Netherlands) |
| FFU | Final Follow-Up (medical treatment) |
| FFU | Filthy Fingers United |
| FFU | Femur-Fibula-Ulna Syndrome |
| FFU | Fred Flintstone Units |
| FFU | Fédération Française d'Ultrasons (French: French Federation of Ultrasound) |
| FFU | Friendly Forward Unit (US Army) |
| FFU | Fluorescent Focus-Forming Unit |
| FFU | Fire Field Underwriter |
| FFU | Final Fantasy Union (gaming website) |
| FFU | Fight for United |
| Acronym | Definition |
| F | Full |
| F | Fax |
| F | Female |
| F | Failure |
| F | FALSE |
| F | Fail |
| F | Fighter (US military aircraft designation; as in F-16) |
| F | Fahrenheit |
| F | If |
| F | Found |
| F | First (class airfare) |
| F | Fast (logic integrated circuits) |
| F | Front |
| F | Field |
| F | Fine |
| F | Ford Motor Company (stock symbol) |
| F | Friend(s) |
| F | Force |
| F | Flash (Precedence Level) |
| F | France (International Auto Identification) |
| F | Registration (Scott Catalogue prefix; philately) |
| F | Forward |
| F | Fine (numismatics; 10th best condition of coin) |
| F | Fine (book condition) |
| F | Function |
| F | Frankfurt (German auto license plates) |
| F | Fixed |
| F | Filter |
| F | Flag |
| F | Fellow |
| F | Flat (welding position) |
| F | Fog (weather teports) |
| F | Frequency |
| F | Fuse |
| F | Fault |
| F | Forte (music) |
| F | Focal length (photography) |
| F | Failing Grade |
| F | Fraction |
| F | Float (C programming language) |
| F | Foul (baseball) |
| F | Fable (video game) |
| F | Felony |
| F | Folio |
| F | Francs |
| F | Fiduciary (IRB) |
| F | Flight Inspection |
| F | Fujita (tornado intensity scale, ranging from F1 to F5) |
| F | Foxtrot |
| F | Fluorine |
| F | Fleer (baseball card manufacturer) |
| F | Phenylalanine (amino acid) |
| F | Bioavailability (fraction of drug reaching systemic circulation) |
| F | Farad |
| F | Fuze |
| F | Flunked |
| F | Flunk |
| F | Fishing Mortality (fisheries population dynamics) |
| F | Femto- (10^-15, SI Prefix) |
| F | Functor (abstract algebra) |
| F | Froude Number |
| F | Faraday Constant |
| F | Functional Distribution |
| F | Filial Generation (genetics) |
| F | Flare Patterns (US DoD) |
| F | Fairchild Aircraft Limited (manufacturer's symbol; Canada) |
| F | Fsmart (China) |
| F | Frequency of Lifting |
| F | Federal Reserve Bank of Atlanta, Georgia (designates original point of circulation of a dollar bill) |
| F | Fisher's F Ratio (statistics; usually written in italics) |
| F | F Sub-Shell (fourth outer subshell of an electron shell) |
| F | Cleared to Fix |
| F | Undenominated United States Stamp (29 cents, introduced 3 Feb 1991) |
| F | At City Shop for Repairs (Alabama Public Safety Radio Code |
| forward (it's last first) |
| JAH | Journal of Adolescent Health |
| JAH | Journal of African History (Cambridge University Press) |
| JAH | Jefferson Alumni Hall (Philadelphia, PA) |
| JAH | Just A Hobby |
| JAH | Jamiat Ahl-e-Hadith (Pakistan political party) |
| JAH | Just Another Hawaiian |
| FUF | Föreninegn för Utvecklingsfrågor (Swedish development organization) |
| FUF | Frank Und Freunde (web design company, Stuttgart, Germany) |
| FUF | Friends of the Urban Forest |
| FUF | Frederikshavn Ungdoms Fællesråd (Danish youth council) |
| FUF | Files under Folders (algorithm) |
| FUF | Forbundet Unge Forskere (Norwegian Association of Young Scientists) |
| FUF | Frequently Used Function |
| FUF | Friends of the Upland Farmer |
| FUF | Fellow Up Front (military slang; polite form) |
| FUF | Fat Ugly Friend |
| |
| COO | Chief Operating Officer (corporate title) |
| COO | Country of Origin |
| COO | Cost of Opperation |
| COO | Change of Ownership (various organizations) |
| COO | Cost of Ownership |
| COO | Come on Over (Internet slang) |
| COO | Communities of Opportunity (San Francisco, CA) |
| COO | Continuity of Operations |
| COO | Certificate Of Origin |
| COO | Cell of Original |
| COO | Chief Operating Officer |
| COO | Conception Orientée Objet (French: Object-Oriented Design; software development) |
| COO | Centre for Overweight and Obesity (Australia) |
| COO | Chief Ordnance Officer (UK) |
| COO | Certificate of Occupancy (construction code compliance) |
| COO | Caltech Optical Observatories |
| COO | Cell of Origin (mobile telephony) |
| COO | Cessna Owner Organization (aircraft) |
| COO | Conduct of Operations |
| COO | Countries of Operation |
| COO | Chiefs of Ontario (Canada) |
| COO | Conspiracy of One (Offspring song) |
| COO | Consideration of Others |
| COO | Concept of Operation |
| COO | College of Opticians of Ontario (Ontario, Canada) |
| COO | Cotonou, Benin - Cotonou (Airport Code) |
| COO | Cave of Ordeal (video games) |
| COO | Constraint and Object Oriented |
| COO | Children of Opportunity |
| COO | Combined Obstacles Overlay |
| COO | confirmation of ownership |
| HA | Hands (Front Page Sports Football '95 et al) |
| backwards 2 letter breakdown |
| HA | High Availability |
| HA | Highly Available |
| HA | Home Agent |
| HA | Heart Attack |
| HA | Hospital Authority |
| HA | Housing Authority |
| HA | Home Address |
| HA | Haiti |
| HA | La Habana (postcode, Cuba) |
| HA | Home Alone |
| HA | Headache |
| HA | Hawaii (old style) |
| HA | Highways Agency (England) |
| HA | Health Affairs |
| HA | Hectares |
| HA | Home Automation (residential housing controls) |
| HA | Health Assessment |
| HA | Hydrogen Alpha |
| HA | Health Administration |
| HA | High Altitude |
| HA | Hells Angels |
| HA | Harrow (postcode, United Kingdom) |
| HA | Human Anatomy (college course) |
| HA | Humanitarian Assistance (US DoD) |
| HA | Historical Association (various organizations) |
| HA | Hyaluronic Acid |
| HA | Humanitarian Assistance |
| HA | Half-Assed |
| HA | High Authority |
| HA | Heritage Area (various locations) |
| HA | Hydroxyapatite |
| HA | Hospital Acquired (Infection) |
| HA | Hidden Ability (Pokémon) |
| HA | Hazard Analysis |
| HA | Hawaiian Airlines (IATA airline code) |
| HA | Hippocampal Atrophy (neurology) |
| HA | Hazard Assessment |
| HA | Health Advisory |
| HA | Hemolytic Anemia |
| HA | Humic Acid |
| HA | Holding Area |
| HA | Hauptabteilung (German) |
| HA | High Assurance |
| HA | Heavy Armor |
| HA | Hepatic Artery |
| HA | Housing Allowance |
| HA | Histocompatibility Antigen |
| HA | Halmahera |
| HA | Hour Angle |
| HA | Heterocyclic Amine (food mutagen) |
| HA | High Ambient (temperature limit) |
| HA | Hospitality Association |
| HA | High Achiever |
| HA | Hemaglutinin (glycoprotein on influenza virus) |
| HA | Highways Act 1980 (UK) |
| HA | Hazardous Area |
| HA | Height-For-Age |
| HA | Honorary Alumnus |
| HA | Hahnium |
| HA | Healthy America |
| HA | Hepatitis-Associated |
| HA | Home Assignment |
| HA | Half Adder |
| HA | Hybrid Algorithm |
| HA | Hemagglutination Assay |
| HA | Haute Activité (French: High Activity; radioactivity) |
| HA | Hostile Aircraft |
| HA | Hydrocephalus Association |
| HA | Hypnotherapy Association |
| HA | High-Alarm |
| HA | Household Activity |
| HA | Haight-Asbury |
| HA | Harmonic Approximation |
| HA | Heidelberg Appeal |
| HA | Hybrid Amplifier |
| HA | Hub Architecture |
| HA | Hexenyl Acetate |
| HA | Hearing Assistant |
| HA | Adopted in the House (approved business of the House of Representatives, North Carolina) |
| HA | Hatch Act of 1887 |
| HA | Hippocampal Asymmetry |
| HA | Hardness Assurance (radiation) |
| HA | Harmonic Analyzer |
| HA | Hall Angle |
| HA | Hospitalman Apprentice (US Navy rating) |
| HA | Hyper-Androgenism |
| HA | Halifax Academy (Roanoke Rapids, North Carolina) |
| HA | Hack Addict (eZine) |
| HA | Hit Avoidance |
| HA | Hit Assessment |
| HA | Hydraulic Association (UK) |
| HA | Hull Array |
| HA | Heavy Assist (nursing) |
| HA | Homelan Alliance (gaming clan) |
| HA | Hanford Operations Office (Department of Energy) |
| HA | Howey Academy (Florida) |
| HA | Hipuric Acid |
| HA | Heyting Arithmetics |
| HA | Hersteld Actief (Dutch) |
| HA | Heterodyne Amplifier |
| HA | Hard Copy Text or Drawing |
| |
| JO | Jordan |
| JO | Job Order |
| JO | Journalist (US Navy) |
| JO | Junior Olympics |
| JO | Jeux Olympiques (French: Olympic Games) |
| JO | Junior Officer |
| JO | Jermaine O'Neal (NBA player) |
| JO | Jedi Outcast (Jedi Knight Lucas Arts game) |
| JO | Journal Officiel de la République Française |
| JO | Joint Operation |
| JO | Judicial Officer |
| JO | Joint Ops (video game) |
| JO | Jamaica Observer |
| JO | Juvenile Offender |
| JO | Journal of Oceanography |
| JO | Juvenile Orion (anime) |
| JO | Just Oral |
| JO | Justice Ombudsman (various locations) |
| JO | Jointly Optimum |
| JO | Jurisdictional Officer (International Order of DeMolay) |
| JO | (USN Rating) Journalist |
| OC | Optical Carrier |
| OC | Orange County (California; New York) |
| OC | Over Clock (computer CPU) |
| OC | Of Course |
| OC | Orange County (TV show) |
| OC | Oklahoma Christian University |
| OC | Ocean City, MD |
| OC | Ocean City |
| OC | Open Carry (firearm possession) |
| OC | Own Character |
| OC | Original Character (fanfiction new, made-up character) |
| OC | OxyContin (prescription drug; aka Oxys) |
| OC | Order Confirmation (purchases) |
| OC | Out of Control |
| OC | Odessa College (Odessa, Texas) |
| OC | Orange Crush |
| OC | Open Circuit (SCUBA and electronics) |
| OC | On Center |
| OC | Online Community |
| OC | Offensive Coordinator (football) |
| OC | Original Content |
| OC | Owl City (band) |
| OC | Organic Carbon |
| OC | Organizing Committee (various organizations) |
| OC | On Camera |
| OC | Office Call |
| OC | Obsessive-Compulsive |
| OC | Oral Contraceptive |
| OC | Off Camera (cinematography) |
| OC | Organized Crime |
| OC | Optical Center |
| OC | Oleoresin Capsicum (active ingredient in pepper spray) |
| OC | Oregon City (Oregon) |
| OC | Oberlin College (Oberlin, Ohio) |
| OC | Overcoat |
| OC | Old Chicago (restaurant) |
| OC | Orospu Cocugu (Turkish: Son of a Bitch) |
| OC | Oregon Coast |
| OC | On Course |
| OC | Order of Canada |
| OC | Oak Cliff (Dallas neighborhood) |
| OC | Communications Division (US Coast Guard) |
| OC | Oliver Cromwell |
| OC | Oral Communication |
| OC | Optional Component (Microsoft Windows) |
| OC | Other Character |
| OC | Officer Commanding |
| OC | Office Coordinator (administrative position) |
| OC | Office of Censorship |
| OC | Operating Cost |
| OC | Oil Cooled (welding) |
| OC | Oversight Committee |
| OC | Office of Communications |
| OC | Overcurrent |
| OC | Operating Company |
| OC | Optical Communications |
| OC | Orientation Course |
| OC | Officer in Command |
| OC | Old Chinese (language of pre 400BC) |
| OC | OpenCup (online tournament) |
| OC | Organochlorine |
| OC | Object Class |
| OC | Open Collector (electronics, transistors) |
| OC | Office of Compliance (US FDA) |
| OC | Owners Corporation (Australia) |
| OC | Officer of the Order of Canada |
| OC | Ottawa-Carleton |
| OC | Old Chap (ham radio shorthand) |
| OC | Optical Channel |
| OC | Operational Control |
| OC | Open Content |
| OC | Operating Characteristic |
| OC | Office of the Commissioner |
| OC | Open Canvas (art program) |
| OC | Office of the Comptroller |
| OC | Oakland City (Indiana College) |
| OC | Operational Capability |
| OC | Operation Center |
| OC | Officer Candidate |
| OC | Operator Console |
| OC | Old Covenant (biblical law) |
| OC | Operant Conditioning (a training technique) |
| OC | Opposing Counsel (legal notation) |
| OC | Outside Corner (measuring in construction) |
| OC | Operating Committee |
| OC | Ondes Courtes (French: shortwave) |
| OC | Orlando Cabrera (baseball player) |
| OC | Obstetric Cholestasis |
| OC | Oxnard College (Oxnard, CA) |
| OC | Over Crowded |
| OC | Operating Carrier |
| OC | Output Compare |
| OC | Observer Controller |
| OC | Open Computing |
| OC | Oceanic Crust |
| OC | Operation Class |
| OC | Output Coupler (optics, lasers) |
| OC | Ocean Conservancy |
| OC | Operations Coordinator |
| OC | Offering Circular |
| OC | Oracle Clinical |
| OC | Oakwood College (Alabama) |
| OC | Oglethorpe County (Georgia) |
| OC | Optical Colonoscopy |
| OC | On-scene Commander |
| OC | Operations Controller |
| OC | Overture Center (performing arts) |
| OC | Output Check |
| OC | Out Calls |
| OC | Organisme Certificateur |
| OC | Out Cast (gaming clan) |
| OC | One Communications, Inc. |
| OC | Occupancy Certificate (residential license) |
| OC | Christian O'Connell (radio personality; UK) |
| OC | Octopus Card (Hong Kong smart payment card) |
| OC | Organisme Conventionné (French: Accredited Body) |
| OC | Operating Curve |
| OC | Operation Channel |
| OC | Omnipotent Carnage (gaming clan) |
| OC | OpenCalphad (computational thermodynamics) |
| OC | Other's Cost |
| OC | Outside Circumference |
| OC | Outdoors Center (Texas A&M) |
| OC | Over-Crossing |
| OC | Ordinary Cadet |
| OC | Orientation Counselor |
| OC | Operation Context |
| OC | Oxygen Cutting |
| OC | Opere Citato (Latin: In the Work Cited) |
| OC | Operator Centralization |
| OC | Organizational Committee of ACC |
| OC | Odin's Court (rock and metal band) |
| OC | Ormiston College |
| OC | Ordres Courants (French: current orders) |
| OC | Oudste Categorie (Dutch) |
| OC | Officer's Cook |
| OC | Otaku Convention (Japanese film festival) |
| OC | Organizadora de Comercio (Spanish; Guatemala) |
| OC | Ordnance Controller |
| OC | Office and Communication Module |
| OC | Outside Contracting/Contractor |
| OC | Order of the Carmelites (religious order) |
| OC | Outage Continuing |
| OC | Outer Chuck |
| OC | Operational Concept/Operating Concept |
| OC | Ochoa & Clary (chemistry team) |
| OC | Open Within Memory Cell |
| |
| FF | Firefox (open source Mozilla-based browser) |
| FF | Fast Forward |
| FF | Form Feed |
| FF | And the Following Pages |
| FF | Following |
| FF | Final Fantasy (game) |
| FF | Final Fantasy |
| FF | Friends and Family |
| FF | Fan Fiction |
| FF | Fantasy Football |
| FF | Surrender (Internet slang) |
| FF | Fighting Fantasy (gamebook series) |
| FF | Friends Forever |
| FF | Fantastic Four |
| FF | Freiwillige Feuerwehr (German: Voluntary Fire Brigade) |
| FF | Fetish Factory (retailer) |
| FF | Fujifilm |
| FF | Flip-Flop |
| FF | Fast Food |
| FF | Firefighter |
| FF | Ford Fiesta (car) |
| FF | Full Force (Jedi Knight game) |
| FF | Fly Fishing |
| FF | French Fries |
| FF | Foo Fighters (band) |
| FF | Fat Free |
| FF | Family Finance (college course) |
| FF | Free Fall |
| FF | Folios |
| FF | Forfeit |
| FF | Franz Ferdinand (band) |
| FF | First Flight (tail symbol for the 1st Fighter Wing at Langley AFB, VA) |
| FF | Flavor Flav (hip-hip) |
| FF | Fortissimo (music) |
| FF | Football Field |
| FF | Federal Funds |
| FF | Force Field |
| FF | Friendly Fire |
| FF | Form Factor |
| FF | Food Fight |
| FF | Frozen Fury (gaming clan) |
| FF | Free Flight |
| FF | Frequent Flyer |
| FF | Fossil Fuel |
| FF | Freedom Fighter (video game) |
| FF | Free-Floating (Rifle Barrel) |
| FF | Full Frame (photography) |
| FF | First Friday |
| FF | Filozofska Fakulteta (Faculty of Arts; Ljubljana, Slovenia) |
| FF | Fresh Frozen |
| FF | Fully Fashioned (nylon stockings) |
| FF | Final Fight (video game) |
| FF | Fontfont (typeface library) |
| FF | Founding Father (educational slang) |
| FF | Fundamental Frequency |
| FF | Force Feedback (joysticks/wheels for games) |
| FF | Fully Functional |
| FF | Fleet Foxes (band) |
| FF | Freight Forwarder |
| FF | Fear Factory (band) |
| FF | Fixed Frequency |
| FF | False Flag |
| FF | Freedom Force (game) |
| FF | Ford Foundation |
| FF | Fianna Fail (Irish Political Party) |
| FF | Flat File |
| FF | Foundation Fieldbus |
| FF | Ford Field (Detroit, MI, USA) |
| FF | Frosted Flakes (cereal) |
| FF | Free-Flyer |
| FF | Flat Faced (pipe flange) |
| FF | Fortress Forever (game mod) |
| FF | French Franc |
| FF | Food First (est. 1975) |
| FF | Fixed Focus (optics, cameras) |
| FF | Final Fortress (Lineage 2 game) |
| FF | Firefinder |
| FF | Fiat Forum (online car forum) |
| FF | Frame Format |
| FF | First Fit (IEEE) |
| FF | Formula Fed (parenting) |
| FF | Flagrant Foul (basketball) |
| FF | Free Fluid (medicine) |
| FF | Fright Fest |
| FF | Filter Factory |
| FF | Feeding Frenzy (gaming) |
| FF | Forced Fumble (football) |
| FF | Freedom Forum |
| FF | Freak Factory |
| FF | Ford Forums |
| FF | Filefront (gaming website) |
| FF | Firefly Festival (Dover, DE) |
| FF | Flash and Flow |
| FF | Fabric Filter (emission control device for coal fired power plants) |
| FF | Fatal Frame (game) |
| FF | Freedom Front (South Africa) |
| FF | Fitness Friend |
| FF | Frostfell (gaming, Asheron's Call) |
| FF | Final Frontier (gaming) |
| FF | Frontier Force |
| FF | Fuel Flow |
| FF | Frou Frou (band) |
| FF | Fit Factor |
| FF | Family Feud (TV game show) |
| FF | Feed Forward |
| FF | Fonky Family (French rap group) |
| FF | Fear Factor (TV show) |
| FF | Floor Flatness (concrete construction) |
| FF | Findhorn Foundation |
| FF | Forward Flight (remote control aircraft hobby) |
| FF | Fully Furnished |
| FF | First Flowering |
| FF | Foot Fault (bowling) |
| FF | Focus Fire (gaming, Warcraft or Starcraft) |
| FF | Fluid Fantasy (forum) |
| FF | Fill Factor (solar cell parameter) |
| FF | Und Folgende (German: and following) |
| FF | Flippin Funny |
| FF | Freight Forward |
| FF | Front-Engine, Front-Wheel-Drive Layout (motor vehicles) |
| FF | Flight Following |
| FF | Fatal Fury (anime/game) |
| FF | Fuel Fabrication |
| FF | Friendship Force |
| FF | Flame Failure |
| FF | Far Field |
| FF | Fixed Filter (RSVP) |
| FF | Functional Food |
| FF | Full Funding |
| FF | Field Format |
| FF | Fraud Forum (GSM Association) |
| FF | Feeling Fine |
| FF | Federal Facility |
| FF | Fancy Feast (cat food) |
| FF | Fatally Flawed |
| FF | Feet Forward (bike, scooter, motorcycle) |
| FF | Full Forward (Australian football position) |
| FF | Franc Français (French Franc) |
| FF | Faerie Fire (gaming, World of Warcraft) |
| FF | Front-Engine Front-Wheel Drive |
| FF | Fat Finger |
| FF | Frozen Fire (German online-gaming clan) |
| FF | Football's Future (online community) |
| FF | Fashion Freak |
| FF | Financial Friend |
| FF | Full Faced (pipe gasket) |
| FF | Family Fortunes |
| FF | Navy Fast Frigate (US DoD) |
| FF | Fast Flash |
| FF | Fuzz Face (guitar effect pedal) |
| FF | Frostfire (game) |
| FF | Factory Finish |
| FF | Fast Frigate |
| FF | Fein-Fein (German: extra fine) |
| FF | Finish-to-Finish (work-management relationship) |
| FF | Ferguson Formula (Jensen automobile) |
| FF | Fellesforbundet |
| FF | Follow Friday (twitter) |
| FF | Flesh Field (band) |
| FF | Finance Forward |
| FF | Full Floater (truck axle) |
| FF | Fiend Folio (roleplaying games, Dungeons & Dragons) |
| FF | Full-Fed (animal science) |
| FF | Farm Foundation |
| FF | Fiamma Fumana (band) |
| FF | Foot's Forecast (Baltimore, MD) |
| FF | Finished Floor Elevation (architectural/civil drafting) |
| FF | Femto-Farad |
| FF | Fire & Forget |
| FF | Facebook Fanatic (social media) |
| FF | Fridley Factors (Minnesota wiffleball league) |
| FF | Final Frenzy (Lineage 2 game) |
| FF | Finstere Flure (game) |
| FF | Furious Force |
| FF | Flight Ferry |
| FF | Fuel Failure |
| FF | Fallen Footwear (shoe company) |
| FF | Foolish Four (Motley Fool investment strategy) |
| FF | Force Forfeit (online games) |
| FF | Fast Fortress (Age of Empires 3 gaming) |
| FF | Failure Factor |
| FF | Fatal Forces (gaming clan) |
| FF | Fatigue Correction Factor (US DoD) |
| FF | Fuchs Friends (online community) |
| FF | Felles Forbundet (Norwegian labour union) |
| FF | Frango Frito (Portuguese: fried chicken) |
| FF | Funfonex (Finnish gaming site) |
| FF | Freestyle Factory (Sweden; est. 2006) |
| FF | Filters Fast LLC (Monroe, North Carolina) |
| FF | Fulton Factor |
| FF | Fraction or Finish |
| FF | Filii Fabricaverunt (Latin: His/Her Sons Built, epigraphy) |
| FF | Forced Fluids (medical care) |
| UF | User Friendly (comic strip) |
| UF | University of Florida |
| UF | University of Findlay |
| UF | Used for |
| UF | Unidade da Federação (Portuguese: Federation Unit; Brazil) |
| UF | Urban Fantasy (fiction) |
| UF | Ultrafiltration |
| UF | Underground Feeder (electrical cable) |
| UF | Unidad de Fomento (Chile) |
| UF | Ultra Force (clothing) |
| UF | Urea/Formaldehyde |
| UF | United Front (Northern Alliance's official name; Afghanistan) |
| UF | Microfarad |
| UF | Uncertainty Factor |
| UF | Ultimate Frisbee (game; like a cross between football and basketball played with a Frisbee) |
| UF | Unframed (Hekimian) |
| UF | United Future (New Zealand) |
| UF | University of Freiburg |
| UF | Utilization Factor |
| UF | Unité Fonctionnelle (French: Functional Unit) |
| UF | You Fool |
| UF | Università di Firenze (Italian) |
| UF | Utility/Utilization Flight |
| UF | Uniform Frame |
| UF | Unit of Fire |
| forward two letter breakdown' |
| FU | Forget You (polite form) |
| FU | Follow-Up |
| FU | Fuse |
| FU | Smoke (aviation meteorology) |
| FU | Freie Universität (Berlin, Germany) |
| FU | Fluorouracil |
| FU | Florida University |
| FU | File Upload |
| FU | Future Use |
| FU | Fordham University |
| FU | Felician University (Franciscan University of New Jersey) |
| FU | Functional Unit |
| FU | First Union (US east coast bank) |
| FU | Furman University (Greenville, SC) |
| FU | Fairfield University |
| FU | Fisk University |
| FU | Foul Up (polite form) |
| FU | Freaks United |
| FU | Follicular Unit |
| FU | Franklin University (Columbus, Ohio) |
| FU | Forretningsudvalg (Danish) |
| FU | Felix Unger (The Odd Couple) |
| FU | Fine Used (philately) |
| FU | Friends University (Kansas) |
| FU | Finlandia University |
| FU | Field Unit (US DoD) |
| FU | Fire Unit |
| FU | Fatih University (Istanbul, Turkey) |
| FU | Forever United |
| FU | Fire & Update |
| FU | Flight Unit |
| FU | Flasher Unit |
| FU | Formula Unit (chemistry) |
| FU | Fixture Unit (plumbing) |
| FU | Functional User |
| FU | Firing Unit |
| FU | Freaking Ugly (polite form) |
| FU | Forward User |
| FU | Fun University (That 70's Show) |
| FU | Forensic Unit |
| FU | Freidman Unit (political slang/meme for six months) |
| FU | Fuerza Unida (Spanish: Thread of Justice; San Antonio, TX) |
| FU | Forever Unchained |
| FU | Fiscal Unit |
| FU | Flamingoz Unlimited (website) |
| FU | Feati Universtiy |
| FU | Farmacias Unidas (Guatemala) |
| ff | ff already in the breakdown above |
| |
| CO | Company |
| CO | Central Office (telecommunications/telephony) |
| CO | Colorado (US postal abbreviation) |
| CO | Commanding Officer |
| CO | Carbon Monoxide |
| CO | Call-Out |
| CO | Colombia |
| CO | Change Order |
| CO | Course |
| CO | Cash Out (mortgage refinancing) |
| CO | County |
| CO | Conference |
| CO | Current Operations |
| CO | Chief Officer |
| CO | Checkout |
| CO | Command |
| CO | Cabinet Office |
| CO | Como (Lombardia, Italy) |
| CO | Colton (blood group) |
| CO | Certificate of Origin |
| CO | Controlling |
| CO | Community Organizer (Philippines) |
| CO | Compliance |
| CO | Chill Out |
| CO | Connection Oriented |
| CO | Combat (game, Natural Selection) |
| CO | Community Outreach |
| CO | Cellular One |
| CO | Complain Of |
| CO | crude oil |
| CO | Charlotte Observer (newspaper) |
| CO | Compliance Officer |
| CO | Cardiac Output |
| CO | Cobalt |
| CO | Colchester (postcode, United Kingdom) |
| CO | Certificate of Occupancy |
| CO | Conan O'Brien |
| CO | Correctional Officer |
| CO | Communications Officer |
| CO | Castor Oil |
| CO | Colonial Office (UK) |
| CO | Cargo Operations |
| CO | Commissioned Officer |
| CO | Compliance Order |
| CO | Captain Obvious |
| CO | Cutoff |
| CO | Chinese Orchestra |
| CO | Compañía (Spanish) |
| CO | Cornish (linguistics) |
| CO | Continental Airlines (airline code) |
| CO | Correction Officer |
| CO | Clinical Operations |
| CO | Covert Operations (gaming) |
| CO | Clean Out (sewers/drains) |
| CO | Combinatorial Optimization (workshop) |
| CO | Contracting Officer |
| CO | Cash Order |
| CO | Consent Order |
| CO | Conscientious Objector |
| CO | Corporación (Spanish) |
| CO | Certifying Officer |
| CO | Combined Operations (gaming) |
| CO | Clerical Officer (obsolete, now AO) |
| CO | Collection Officer |
| CO | Clothes Optional |
| CO | Champions Online (game) |
| CO | Constant Observation (medical care) |
| CO | Command Output |
| CO | Circle Officer (India) |
| CO | Core Operation(s) |
| CO | Clinical Officer (hospital) |
| CO | Command Operations |
| CO | Commitment to Perform (common feature; Capability Maturity Model Integration) |
| CO | Chief Operator |
| CO | Consoleone (Novell GUI) |
| CO | Cargo Oil |
| CO | Combinatorics and Optimization (field of pure mathematics) |
| CO | Contracting Official |
| CO | Convert Out |
| CO | Consumer Ombudsman (UK) |
| CO | Conservation Operations |
| CO | Conseiller d'Orientation (French) |
| CO | Case Operations |
| CO | Certified Orthotist (ABC) |
| CO | Columbia Orchestra (Ellicott City, MD) |
| CO | Comitissa (Latin: Countess, Codices And Manuscripts) |
| CO | Custodial Officer |
| CO | Constraint Oriented |
| CO | Chosen Overseer |
| CO | Coastal Chart |
| CO | Circuit Overseer (Jehovah's Witnesses) |
| CO | Caucasian Ovtcharka (dog breed) |
| CO | Command Outpost |
| CO | Captive Office (Nortel) |
| CO | Consolidated Obligation |
| CO | Air Post Official (Scott Catalogue prefix; philately) |
| CO | Ciceronian Oration |
| CO | Combat Aptitude Area |
| CO | Congregation of the Oratory, Oratorians (religious order) |
| CO | Comercializadora de Occidente SA (Guatemala) |
| |
| OJ | Orange Juice |
| OJ | Official Journal (European Communities) |
| OJ | Object (assembly language ASM51 assembler control) |
| OJ | Officejet (printer) |
| OJ | Orange Julius (smoothie shop) |
| OJ | Orenthal James (Simpson) |
| OJ | Open Jaw (airfare construction) |
| OJ | Orlando Jordan (wrestler) |
| OJ | Orlando Jones (actor) |
| OJ | Outdoor Japan (magazine) |
| OJ | Only Joking |
| OJ | Ontario Judgments |
| OJ | Organisation Jeunesse (French: youth organization) |
| OJ | Omar Jacobs (Bowling Green State University football quarterback) |
| OJ | Optical Jamming |
| OJ | Offensive Jammer |
| OJ | Orpington Juniors (est. 1965) |
| OJ | oral jejunum (medical) |
| happy forgetters has HA, ah |
| AH | Ampere-Hour |
| AH | Art History (various universities) |
| AH | Ass Hole |
| AH | After Hours |
| AH | Auction House |
| AH | Attack Helicopter |
| AH | Adaptive Hypermedia |
| AH | Achievement Hunter (gaming) |
| AH | Adolf Hitler |
| AH | Affordable Housing |
| AH | Arterial Hypertension |
| AH | Austria-Hungary |
| AH | Alternate History (fiction genre) |
| AH | Hospital Ship |
| AH | Arts and Humanities |
| AH | Aryl Hydrocarbon |
| AH | American Health (journal) |
| AH | Alien Hominid (game) |
| AH | Alyson Hannigan (actress) |
| AH | Albert Heijn |
| AH | Army Hospital |
| AH | Authentication Header |
| AH | Animal House (movie) |
| AH | Aldehyde |
| AH | Antihistamines |
| AH | Austin-Healy (British automobile brand) |
| AH | Auditory Hallucination |
| AH | Application Header (TMN) |
| AH | Advanced Higher (education) |
| AH | Available Hours |
| AH | Arathi Highlands (gaming, World of Warcraft) |
| AH | Australian Hard (Wheat) |
| AH | Artificial Horizon |
| AH | Abbie Hoffman (activist) |
| AH | Aspen Hill (Maryland) |
| AH | Alternative Hypothesis |
| AH | Ad Honorem (Latin: in honor of, epigraphy) |
| AH | Air Handler |
| AH | Address Handling (3GPP function of the CSCF) |
| AH | Armor Holdings, Inc. (now BAE Systems Mobility & Proection Systems) |
| AH | Allan Houston (NBA Player) |
| AH | Absolute Humidity |
| AH | Anno Hegirae |
| AH | Anchorhead (gaming, Star Wars Galaxies) |
| AH | Angela Hewitt (classical pianist) |
| AH | After the Hijrah |
| AH | Anfernee Hardaway (basketball player) |
| AH | Applicant's Handbook |
| AH | Adaptive Hypertext and Hypermedia |
| AH | Amphipathic Helix |
| AH | American Honda Motor Co., Inc. |
| AH | Amersham Health |
| AH | ácido hialurónico |
| AH | Automated Howitzer |
| AH | Angell Hall (University of Michigan) |
| AH | Akademiya Nauk (Russian Academy of Sciences) |
| AH | Anaheim Hills, California |
| AH | Agricultural Holding |
| AH | Air Algerie - Algeria (IATA airline code) |
| AH | AnimeHeaven (IRC) |
| AH | Add Halfword (IBM) |
| AH | Acronym Hell |
| AH | Alternate Headquarters |
| AH | Aqua Harvest Limited (startup aquaculture project) |
| AH | AeroHydro (CAD vendor) |
| AH | Apocalyptic Harbingers (gaming clan) |
| AH | Airfield Heliport |
| AH | Accent Height |
| AH | Attention Horde (gaming clan) |
| AH | Allowance Holder |
| AH | Access Handoff |
| AH | Associate Hermite (expansion) |
| AH | Airedale Harriers (UK) |
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