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Fisher–Yates shuffle
The Fisher–Yates shuffle, also called the Knuth shuffle, is an algorithm that randomly permutes a sequence so every ordering is equally likely, running in place in linear time.
Fisherman's knot
The fisherman's knot, also called the angler's knot, is a bend of two interlocked overhand knots used to join two ropes of equal diameter, especially in fishing.
Fisheye lens
A fisheye lens is an ultra-wide-angle camera lens that maps a field of view of 180 degrees or more onto the sensor with strong barrel distortion.
Fishing trawler
A fishing trawler, also called a fishing dragger, is a vessel that tows a large funnel-shaped trawl net through the water to catch fish and shellfish in bulk.
Fishplate
A fishplate, also called an angle bar or splice bar, is a metal bar bolted to the sides of two rail ends to join them in railway track.
Fiskars
Fiskars is Finland's oldest company, a consumer goods maker founded as an ironworks in 1649 and known worldwide for its orange-handled scissors, first made in 1967.
Fisker Automotive
Fisker Automotive was an American car company founded by designer Henrik Fisker in 2007, which built the Fisker Karma luxury plug-in hybrid before filing for bankruptcy in 2013.
Fisker Inc.
Fisker Inc. was an American electric-vehicle manufacturer founded in 2016 by designer Henrik Fisker, known for the Fisker Ocean SUV, which it built from 2023 until bankruptcy in 2024.
Fisker Karma
The Fisker Karma is a four-door luxury plug-in hybrid sedan launched in 2011 by Henrik Fisker's Fisker Automotive; the company went bankrupt in 2013, and Wanxiang continued the car as Karma Automotive.
Fission gas release
Fission gas release is the escape of gaseous fission products, chiefly xenon and krypton, from nuclear fuel pellets into the fuel rod's free volume during irradiation.
Fission-fragment rocket
The fission-fragment rocket is a proposed spacecraft propulsion concept, first described by George Chapline in the late 1980s, that uses fission fragments directly as exhaust.
Fissler
Fissler is a German family-owned manufacturer of premium cookware, founded in 1845 by tinsmith Carl Philipp Fissler in Idar-Oberstein and known for inventing the safe home pressure cooker in 1953.
Fist (telegraphy)
In telegraphy, a fist is an operator's individual hand-sending style in Morse code, distinctive enough that a receiving operator can identify the sender by sound alone.
FIT (file format)
FIT (Flexible and Interoperable Data Transfer) is a compact binary file format created by Garmin for storing data from sport, fitness, and health devices such as GPS watches.
Fit for 55
Fit for 55 is a package of European Union laws, presented by the European Commission in July 2021, to cut net greenhouse gas emissions by at least 55% by 2030.
Fitbit Charge
The Fitbit Charge is a line of wristband fitness trackers made by Fitbit, later Google, tracking steps, heart rate, sleep, and workouts from 2014 through the Charge 6 in 2023.
Fitbit Inspire
Fitbit Inspire is a line of slim, band-style fitness trackers from Fitbit, introduced in early 2019; its current model, the Inspire 3, launched in 2022 at $99.95.
Fitbit Sense
The Fitbit Sense is a health smartwatch Fitbit released in 2020, the first with an electrodermal activity sensor for stress tracking, and an ECG app cleared by the FDA.
Fitbit Versa
The Fitbit Versa is a line of smartwatches made by Fitbit, an American company acquired by Google in 2021, sold from 2018 to 2022 in four main models.
FITS
FITS (Flexible Image Transport System) is an open, self-describing file format used in astronomy, developed in the late 1970s and endorsed by NASA and the International Astronomical Union.
Five by five
Five by five is a radio signal report meaning loud and clear: 5 rates signal strength and 5 rates readability, the best score on both scales.
Five-axis machining
Five-axis machining is a subtractive manufacturing process where a milling cutter moves along three linear and two rotary axes, machining parts like impellers and turbine blades in a single setup.
Five-bar linkage
The five-bar linkage is a planar mechanism with five links and two degrees of freedom, driven by two actuators on its base, used in parallel robots.
Five-Story Pagoda of Hōryū-ji
The Five-Story Pagoda of Hōryū-ji (法隆寺五重塔, Hōryū-ji Gojū-no-tō) is a wooden Buddhist pagoda at Hōryū-ji temple in Ikaruga, Nara Prefecture, Japan, the oldest surviving five-story wooden pagoda in the world.
Fivetran
Fivetran (Fivetran + dbt Labs) is an Oakland, California-based managed ELT data movement platform with 700+ connectors, usage-based MAR pricing, and a 2021 $5.6B valuation; it completed an all-stock merger with dbt Labs in June 2026 at roughly $600M ARR.
Fixed wireless access
Fixed wireless access is broadband internet delivered to homes and businesses over a radio link instead of a wired line, now commonly offered by carriers as 5G home internet.
Fixed-base operator
A fixed-base operator (FBO) is a commercial business granted rights by an airport sponsor to provide aeronautical services such as fueling, maintenance, hangaring, and flight instruction to the public.
Fixed-bed gasifier
A fixed-bed gasifier is a gasification reactor in which solid fuel rests on a grate while air, oxygen, or steam flows through it, converting the fuel into producer gas.
Fixed-complexity sphere decoder
The fixed-complexity sphere decoder (FSD) is a MIMO detection algorithm proposed by Barbero and Thompson of the University of Edinburgh in 2006, offering fixed complexity with near maximum-likelihood performance.
Fixed-end moment
The fixed-end moment is the bending moment at the end of a beam restrained against rotation at both ends, the starting point for slope-deflection and moment distribution analysis.