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from Wikipedia:

FL or variations may refer to:

Businesses and organizations
AirTran Airways (IATA airline code), defunct American airline
FL Group, an Icelandic investment company with an emphasis on flight and tourism industry
Foot Locker (ticker symbol), retailer
Numismatics
Florin (disambiguation), various coins
Guilder, various coins also sometimes called "florin"
Places
Florida (United States postal abbreviation)
Liechtenstein (Fürstentum Liechtenstein)
Science and technology
Biology and medicine
FLT3LG (Fms-related tyrosine kinase 3 ligand), a protein
Fluffy transcription factor, gene of Neurospora crassa
Fluorouracil (5-FU), and leucovorin (folinic acid), a chemotherapy regimen for treating colon cancer
Follicular lymphoma in medicine
Frontal lobe, the largest brain lobe
Mathematics and computing
FL (complexity), a class of functions in complexity theory
FL (programming language), a functional programming language
Adobe Flash Professional, software which uses "Fl" as its icon abbreviation
FL Studio, a music production software program
Other uses in science and technology
Femtolitre, a metric unit of volume
Flerovium, chemical element 114
Flight level, a standard nominal altitude of an aircraft, in hundreds of feet
"Fluid", as in fluid ounce (fl oz)
Foot-lambert, a unit of luminance
Friedmann–Lemaître metric in cosmology
Sport
Federal League, a United States baseball league in 1914
English Football League, the governing body of two of the leagues in the English football pyramid
Genealogy
Floruit, Latin for he/she flourished, referring to a time period in which someone was known to be alive or active
Other uses
fl (fl), a typographical ligature
Flavius, a gens (family name) or praenomen (personal name) in ancient Rome
Flawless, a grade of diamond clarity
Fork length, a standard fish measurement
Free List (Liechtenstein), a center-left political party in Liechtenstein
Volvo FL, a medium weight truck developed by Volvo