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Fixed-gear bicycle
A fixed-gear bicycle, also called a fixie or fixed-wheel bike, is a bicycle whose rear sprocket is rigidly connected to the hub, making coasting impossible; track racers use them.
Fixed-pitch propeller
A fixed-pitch propeller (FPP) is a marine propeller with blades cast at one permanent angle, the simplest and most common propeller type, controlled only by shaft speed and direction.
Fixed-price contract
A fixed-price contract is an agreement where the buyer pays a set amount regardless of the seller's costs, the most common contract model in software development.
Fixed-satellite service
The fixed-satellite service (FSS) is a radiocommunication service between earth stations at fixed positions, using one or more satellites, defined by the ITU Radio Regulations.
Fixed-wing aircraft
A fixed-wing aircraft is a heavier-than-air flying machine that generates lift from rigid wings fixed in position, in contrast to helicopters; it includes airplanes and gliders, and first flew in 1903.
Fixing America's Surface Transportation Act
The Fixing America's Surface Transportation Act, or FAST Act, is a US federal law enacted in 2015 that authorized roughly $305 billion over five years for highways, transit, and rail.
FK-3000
The FK-3000 is a Chinese self-propelled short-range air defense system by CASIC, pairing a 30mm cannon with up to 96 small missiles against drone swarms.
FL (complexity)
FL is the complexity class of functions computable by a deterministic Turing machine using only logarithmic space, the functional counterpart of L, and the class of logspace reductions.
FLAC
FLAC (Free Lossless Audio Codec) is an open, patent-free lossless audio format, first specified in 2000, that compresses audio to 30-70% of its size with no data loss.
Flag carrier
A flag carrier, also known as a national carrier or flagship airline, is a national airline a state designates, owns, or promotes as its representative in international air transport.
Flag of convenience
A flag of convenience, also called an open registry, lets shipowners register vessels in countries with little real connection to the ship, reducing costs, taxes, and regulatory oversight.
Flag semaphore
Flag semaphore, also called semaphore flags, is a visual signaling system in which a person holds two hand-held flags at set angles to represent letters and numerals.
FlagEval
FlagEval, also known as Libra, is an open-source evaluation platform built by the Beijing Academy of Artificial Intelligence in 2022 to benchmark foundation models across language, vision, and audio tasks.
FLAGS register
The FLAGS register, extended as EFLAGS and RFLAGS, is the x86 status register holding single-bit arithmetic results and system flags controlling interrupts, I/O privilege, and processor modes.
Flagship
A flagship is the ship carrying a fleet's commander, usually an admiral, distinguished by flying his flag; figuratively it means any leading example of a class.
Flagship Airlines Flight 3379
Flagship Airlines Flight 3379 was an American Eagle commuter flight that crashed near Raleigh-Durham International Airport on December 13, 1994, killing 15 of the 20 aboard.
Flail (weapon)
The flail, also known as the war flail, is a medieval weapon of solid striking heads joined to a grip by chain or cord, adapted from a grain-threshing tool.
Flair (NLP software)
Flair is an open-source Python framework for natural language processing built on PyTorch, released by Zalando Research in 2018 and known for contextual string embeddings and named entity recognition.
Flair Airlines
Flair Airlines is a Canadian low-cost airline headquartered in Edmonton, Alberta, founded as a charter operator in 2005 and repositioned in 2017 as an ultra-low-cost carrier.
Flak jacket
The flak jacket, also called a flak vest, is a sleeveless vest of ballistic fabric or plates protecting the torso against fragmentation from artillery, mortars, mines, and grenades.
Flak tower
A flak tower (Flakturm) is a massive concrete anti-aircraft platform and air-raid shelter built in Berlin, Hamburg, and Vienna under the Nazi regime between 1940 and 1944.
Flake (chocolate bar)
Cadbury Flake is a British chocolate bar made by Cadbury from thinly folded milk chocolate with a crumbly texture, first made in 1920 at the Bournville factory.
Flakey (robot)
Flakey was an autonomous mobile robot developed at SRI International in Menlo Park, California, in the mid-1980s as the successor to Shakey, known for its fuzzy-logic navigation controller.
Flaky test
A flaky test is a software test that passes on some runs and fails on others on the same code, with no change to the test or program.
Flamanville nuclear power plant
The Flamanville nuclear power plant is an EDF nuclear station in Normandy, France, with two reactors from 1985 and 1986 plus the EPR Flamanville 3, connected to the grid in 2024.
Flame
A flame is a self-sustaining combustion zone that spreads through a fuel-oxidizer mixture at subsonic speeds, usually emitting light and heat, and classified as premixed or diffusion.
Flame retardant
A flame retardant, also called flame resistant or flameproofing, is a chemical applied to products to prevent or slow fires; many persist in the body and raise health concerns.
Flame spraying
Flame spraying is a thermal spray coating process that melts wire or powder feedstock in an oxygen-fuel flame and propels it onto a surface as a coating.
Flame synthesis
Flame synthesis is a fabrication method using combustion flames to convert vaporized or liquid precursors into nanoparticles, coatings, and other inorganic solids, including carbon black and fumed silica.
Flame-bladed sword
A flame-bladed sword, called a flammard or flamberge, is a sword with a wavy blade, used on Landsknecht two-handers and rapiers in the 16th to 18th centuries.