FL or variations may refer to:

Businesses and organizations

AirTran Airways AirTran Airways was a low-cost U.S. airline that was originally headquartered in Orlando, Florida, and ceased operation following its acquisition by Southwest Airlines. AirTran Airways was established in 1993 as Conquest Sun Airlines by the ...

(IATA airline code), defunct American airline *

FL Group Stodir ( is, Stoðir, FL Group prior to 4 June 2008) is a majority family-owned investment company located in Reykjavík, Reykjavík, Iceland. The company was founded on July 20, 1973, under the name Flugleiðir. It was formed as a holding compa ...

, an Icelandic investment company with an emphasis on flight and tourism industry *

Foot Locker Foot Locker Retail, Inc. is an Americans, American sportswear and footwear retailer, with its headquarters in Midtown Manhattan, New York City, and operating in 28 countries. Although established in 1974, and founded as a separate company in ...

(ticker symbol), retailer

Numismatics

Florin (disambiguation) The florin was a former coin of the Republic of Florence. It may also refer to: Modern currencies * The Netherlands Antillean guilder (abbreviated ANG) is also known as a "florin", and abbreviated NAFl * Aruban florin, the currency of Aruba * Hun ...

, various coins *

Guilder Guilder is the English translation of the Dutch and German ''gulden'', originally shortened from Middle High German ''guldin pfenninc'' "gold penny". This was the term that became current in the southern and western parts of the Holy Roman Empir ...

, various coins also sometimes called "florin"

Places

Florida Florida is a state located in the Southeastern region of the United States. Florida is bordered to the west by the Gulf of Mexico, to the northwest by Alabama, to the north by Georgia, to the east by the Bahamas and Atlantic Ocean, and to ...

(United States postal abbreviation) *

Liechtenstein Liechtenstein (), officially the Principality of Liechtenstein (german: link=no, Fürstentum Liechtenstein), is a German-speaking microstate located in the Alps between Austria and Switzerland. Liechtenstein is a semi-constitutional monarchy ...

(''Fürstentum Liechtenstein'')

Science and technology

Biology and medicine

FLT3LG Fms-related tyrosine kinase 3 ligand (FLT3LG) is a protein which in humans is encoded by the ''FLT3LG'' gene. Flt3 ligand (FL) is a hematopoietic four helical bundle cytokine. It is structurally homologous to stem cell factor (SCF) and colony s ...

(Fms-related tyrosine kinase 3 ligand), a protein *

Fluffy transcription factor The fluffy (fl) gene of ''Neurospora crassa'' is required for asexual sporulation and encodes an 88 kDa polypeptide containing a typical fungal A fungus ( : fungi or funguses) is any member of the group of eukaryotic organisms that incl ...

, gene of ''Neurospora crassa'' * Fluorouracil (5-FU), and leucovorin (folinic acid), a

chemotherapy regimen A chemotherapy regimen is a regimen for chemotherapy, defining the drugs to be used, their dosage, the frequency and duration of treatments, and other considerations. In modern oncology, many regimens combine several chemotherapy drugs in combinat ...

for treating colon cancer *

Follicular lymphoma Follicular lymphoma (FL) is a cancer that involves certain types of white blood cells known as lymphocytes. The cancer originates from the uncontrolled division of specific types of B-cells known as centrocytes and centroblasts. These cells normal ...

in medicine *

Frontal lobe The frontal lobe is the largest of the four major lobes of the brain in mammals, and is located at the front of each cerebral hemisphere (in front of the parietal lobe and the temporal lobe). It is parted from the parietal lobe by a groove betwe ...

, the largest brain lobe

Mathematics and computing

* FL (complexity), a class of functions in complexity theory *

FL (programming language) FL (short for "Function Level") is a programming language created at the IBM Almaden Research Center by John Backus, John Williams, and Edward Wimmers in the 1980s and documented in a report from 1989. FL was designed as a successor of Backus' ea ...

, a functional programming language *

Adobe Flash Professional Adobe Animate (formerly Adobe Flash Professional, Macromedia Flash, and FutureSplash Animator) is a multimedia authoring and computer animation program developed by Adobe Inc. Animate is used to design vector graphics and animation for televi ...

, software which uses "Fl" as its icon abbreviation *

FL Studio FL Studio (previously known as FruityLoops before 2003) is a digital audio workstation (DAW) developed by the Belgian company Image-Line. FL Studio features a graphical user interface with a pattern-based music sequencer. The program is avail ...

, a music production software program

Other uses in science and technology

Femtolitre The litre (international spelling) or liter (American English spelling) (SI symbols L and l, other symbol used: ℓ) is a metric unit of volume. It is equal to 1 cubic decimetre (dm3), 1000 cubic centimetres (cm3) or 0.001 cubic metre (m3). ...

, a metric unit of volume *

Flerovium Flerovium is a Transactinide element, superheavy chemical element with Chemical symbol, symbol Fl and atomic number 114. It is an extremely radioactive synthetic element. It is named after the Flerov Laboratory of Nuclear Reactions of the Joint ...

, symbol Fl, a chemical element *

Flight level In aviation and aviation meteorology, a flight level (FL) is an aircraft's altitude at standard air pressure, expressed in hundreds of feet. The air pressure is computed assuming an International Standard Atmosphere pressure of 1013.25 hPa ...

, a standard nominal altitude of an aircraft, in hundreds of feet * "Fluid", as in

fluid ounce A fluid ounce (abbreviated fl oz, fl. oz. or oz. fl., old forms ℥, fl ℥, f℥, ƒ ℥) is a unit of volume (also called ''capacity'') typically used for measuring liquids. The British Imperial, the United States customary, and the United St ...

(fl oz) *

Foot-lambert A foot-lambert or footlambert (fL, sometimes fl or ft-L) is a unit of luminance in United States customary units and some other unit systems. A foot-lambert equals 1/π or 0.3183 candela per square foot, or 3.426 candela per square meter (the corre ...

, a unit of luminance * Friedmann–Lemaître metric in cosmology

Sport

Federal League The Federal League of Base Ball Clubs, known simply as the Federal League, was an American professional baseball league that played its first season as a minor league in 1913 and operated as a "third major league", in competition with the e ...

, a United States baseball league in 1914 *

English Football League The English Football League (EFL) is a league of professional football clubs from England and Wales. Founded in 1888 as the Football League, the league is the oldest such competition in the world. It was the top-level football league in Engl ...

, the governing body of two of the leagues in the English football pyramid

Genealogy

* ''

Floruit ''Floruit'' (; abbreviated fl. or occasionally flor.; from Latin for "they flourished") denotes a date or period during which a person was known to have been alive or active. In English, the unabbreviated word may also be used as a noun indicatin ...

'', Latin for he/she flourished, referring to a time period in which someone was known to be alive or active

Other uses

* (fl), a typographical ligature *

Flavius The gens Flavia was a plebeian family at ancient Rome. Its members are first mentioned during the last three centuries of the Republic. The first of the Flavii to achieve prominence was Marcus Flavius, tribune of the plebs in 327 and 323 BC; ...

, a ''gens'' (family name) or ''praenomen'' (personal name) in ancient Rome * Flawless, a grade of

diamond clarity Diamond clarity is the quality of diamonds that relates to the existence and visual appearance of internal characteristics of a diamond called ''inclusions'', and surface defects, called ''blemishes''. Clarity is one of the four Cs of diamond grad ...

* Fork length, a standard

fish measurement Fish measurement is the measuring of individual fish and various parts of their anatomies. These data are used in many areas of ichthyology, including taxonomy and fisheries biology. Overall length * Standard length (SL) is the length of a fish ...

Free List (Liechtenstein) The Free List (german: Freie Liste, FL) is a green political party in Liechtenstein. As of 2017, it has three seats in the Landtag of Liechtenstein and is represented in six of the eleven local councils. It was founded in 1985 and described itself ...

, a center-left political party in Liechtenstein *

Volvo FL The Volvo FL is Volvo's smallest truck and is suitable for local and regional distribution operations, refuse collection, construction truck or small format tractor. The Volvo FL has been built since the summer of 1985 in a variety of different mo ...

, a medium weight truck developed by Volvo