All articles starting with F

FPSRussia

FPSRussia, also known as FPSKyle, is an American YouTube web series created by Kyle Myers and Keith Ratliff in 2010, in which Myers plays a Russian weapons enthusiast named Dmitri.

FPT (complexity)

FPT, or fixed-parameter tractable, is the class of decision problems solvable in time f(k)·n^O(1), where k is a parameter, isolating exponential growth in k; it is the parameterized analog of P.

An FPTAS, or fully polynomial-time approximation scheme, is the strongest guarantee in the approximation hierarchy, combining arbitrarily good accuracy with running time polynomial in input size and 1/ε.

FPV attack drone

An FPV attack drone is a single-use kamikaze drone piloted through goggles with a live camera feed, industrialized as a weapon in the Russia-Ukraine war.

Fquih Ben Salah Province

Fquih Ben Salah Province (إقليم الفقيه بن صالح), Morocco, created 2009 from Beni Mellal Province in Béni Mellal-Khénifra region; capital Fquih Ben Salah city; 502,827 people (2014), leading regional milk producer.

FR Germany

FR Germany (FRG) was the athletics designation for West Germany, 1949-1990, now merged under GER. Known for the 14:38.8 men's 4x1500m world record of 1977, the 42.81 women's 4x100m Olympic record of 1972, and Carl Kaufmann's 44.9 400m.

FR-4

FR-4, also called Flame Retardant 4, is a NEMA grade of flame-retardant woven-glass epoxy laminate rated UL 94 V-0 that serves as the base material of most printed circuit boards.

FR3 (frequency range)

FR3 (Frequency Range 3) is the 3GPP upper mid-band spectrum from 7.125 to 24.25 GHz, between FR1 and FR2, and the leading candidate for 6G spectrum.

Fra a 1

Fra a 1 is the major strawberry (Fragaria × ananassa) fruit allergen, a PR-10 protein homologous to birch pollen Bet v 1; isoform Fra a 1.02 is most potent, causing oral allergy syndrome in birch-pollen-allergic patients.

Fra Angelico

Fra Angelico (Guido di Piero, Fra Giovanni da Fiesole, c. 1395-1455) was a Dominican friar and early Renaissance Florentine painter of altarpieces, frescoes, and miniatures, famed for the San Marco convent frescoes, the Niccoline Chapel, and beatification in 1982.

Oct 22, 2026

Fra Bartolomeo

Fra Bartolomeo (1472–1517), also written Fra Bartolommeo and known before his religious profession as Baccio della Porta, was an Italian painter and Dominican friar, one of the leading Florentine painters of the early 16th century.

Fra e 1

Fra e 1, major allergen of European ash (Fraxinus excelsior) pollen, a 145-amino-acid glycoprotein of the Ole e 1-like family; strongly cross-reactive with olive Ole e 1, which serves as its diagnostic marker.

Fra Fee

Fra Fee (Francis Martin Fee, born 1987, Dungannon) is a Northern Irish actor and singer, Royal Academy of Music graduate, known for Les Misérables, The Ferryman (WhatsOnStage Award), Hawkeye, Rebel Moon, Cabaret, and Unchosen; married to Declan Bennett, living in Oxfordshire.

Fra Mauro (lunar crater)

Fra Mauro, a 96.76 km eroded crater on the Moon's near side at 6.08 S, 17.00 W, named for a 15th century Italian monk-cartographer; its ejecta formation was the Apollo 14 landing site, February 1971.

Fra Mauro map

The Fra Mauro map is a large circular world map drawn around 1450 by the Camaldolese monk Fra Mauro in Venice, and now kept in the Biblioteca Nazionale Marciana.

Frac pack

A frac pack is a well completion combining hydraulic fracturing with gravel packing in one operation, for sand control and stimulation, first used in the Gulf of Mexico in the early 1980s.

Frac spread

The frac spread is the difference between the value of natural gas liquids extracted from a gas stream and their value if sold as natural gas.

Fracastorius (lunar crater)

Fracastorius is a 120.58-km IAU-approved lava-flooded lunar crater on the southern edge of Mare Nectaris, named for Girolamo Fracastoro by Riccioli in 1651, with a largely missing northern wall.

Fracking

Fracking, also called hydraulic fracturing, is a well stimulation technique first used commercially in 1949 that cracks tight rock to release oil and natural gas.

Fractal

A fractal is a geometric object whose structure repeats across scales, so magnifying a part reveals detail resembling the whole; the term was coined by Benoît Mandelbrot in 1975.

Sep 29, 2026

Fractal analysis

Fractal analysis is a family of mathematical and statistical methods that quantify self-similar, scale-invariant structure in images, point sets, and time series, used in physics, biomedical imaging, and machine learning.

Fractal antenna

A fractal antenna is an antenna whose self-similar, fractal geometry lets one compact element resonate at multiple frequencies and fit a long electrical path into a small footprint.

Fractal cosmology

Fractal cosmology is a family of proposals in physical cosmology that the galaxy distribution, or spacetime itself, is fractal; SDSS and WiggleZ surveys find homogeneity beyond roughly 70–100 megaparsecs.

Fractal dimension

The fractal dimension measures how an object's size grows as measurement scale shrinks, taking non-integer values for irregular sets; Mandelbrot estimated Britain's coastline at 1.25 in 1967.

Oct 22, 2026

Fractal topological insulators

Fractal topological insulators are topological phases of matter defined on fractal lattices, such as the Sierpiński carpet and gasket, which lack translational symmetry and occupy a fractional dimension.

Fractile

Fractile is a British semiconductor startup, founded in 2022 by Walter Goodwin as an Oxford spin-out, developing memory-centric chips for AI inference, with first deployments targeted for 2027.

Fraction

A fraction is a number written a over b, representing a parts of a whole divided into b equal parts, with a the numerator and b the denominator.

Fraction of inspired oxygen

Fraction of inspired oxygen (FiO2) is the fraction of oxygen in inhaled gas, 0.209 for room air and up to 1.00 for pure oxygen, central to oxygen therapy and ventilation.

Fractional Brownian motion

Fractional Brownian motion is a centered Gaussian stochastic process, defined by Mandelbrot and Van Ness in 1968, that generalizes Brownian motion with correlated increments governed by a Hurst parameter.