All articles starting with F
15,892 articles
Fivestars
Fivestars was a San Francisco startup founded in 2011 that combined loyalty, marketing, and payments for small merchants in the US and Canada, acquired by SumUp for $317 million in 2021.
FiveThirtyEight
FiveThirtyEight (538) is a data-journalism site founded by Nate Silver in 2008, covering poll analysis, politics, economics, and sports; known for pollster ratings, polling averages, and election forecasts under NYT, ESPN, then ABC News.
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.
Fivio Foreign
Fivio Foreign, real name Maxie Lee Ryles III, is a Brooklyn drill rapper whose 2019 gold single "Big Drip" and B.I.B.L.E. album made him a leading New York drill figure.
Fix You
Fix You is a 2005 Coldplay song, the second single from X&Y, written for Gwyneth Paltrow after her father's death, built on a church-organ intro and a guitar crescendo, peaking at UK downloads no. 7.
FIX-Chagas trial
FIX-Chagas (NCT05519046) is a randomized InCor Heart Institute trial in São Paulo comparing cardiac contractility modulation with CRT in 60 patients with Chagas cardiomyopathy, heart failure, and non-left bundle branch block.
Fix-up
Fix-up (fix-up novel): a novel assembled from previously published short stories or novellas, linked with new material; term coined by A.E. van Vogt, common in science fiction, exemplified by I, Robot and The Martian Chronicles.
Fixation (histology)
Fixation (histology): tissue preservation from autolysis, chiefly by formaldehyde/formalin crosslinking. Key facts: 10% neutral buffered formalin standard, 4% PFA, 6–48 h HER2 window, antigen retrieval, freezing alternative.
Fixation index
The fixation index, written F ST, is a population genetics statistic measuring genetic differentiation among subpopulations, introduced by Sewall Wright in work published in 1931 and 1943.
Fixed asset
A fixed asset, known in accounting as property, plant, and equipment, is a long-lived tangible asset such as a building, machine, or vehicle used in operations rather than held for resale.
Fixed Bayonets!
Fixed Bayonets! (1951) is Samuel Fuller's Twentieth Century-Fox Korean War drama, also titled Rearguard, in which Richard Basehart's Cpl. Denno must take command of a 48-man rearguard platoon holding a mountain pass.
Fixed cost
A fixed cost is a cost like rent, insurance, or executive salaries that is unaffected by output levels within certain limits, and only in the short run.
Fixed cutaneous sporotrichosis
Fixed cutaneous sporotrichosis (ICD-11 1F2J.1) is the localized, non-lymphatic form of Sporothrix skin infection, about 25% of cutaneous cases, treated with itraconazole 200 mg daily for 3-6 months.
Fixed deposit
A fixed deposit (FD) is a bank deposit held for a fixed term at a fixed interest rate, called a certificate of deposit in the United States.
Fixed drug eruption
Fixed drug eruption (FDE): a cutaneous adverse drug reaction recurring at the same skin site on re-exposure, caused by epidermal CD8+ memory T cells; severe variant GBFDE has 15.2% mortality.
Fixed effects model
The fixed effects model is a panel data regression that controls for unobserved, time-invariant unit differences via demeaning or unit dummies, at the cost of losing time-invariant variables.
Fixed income
Fixed income is the class of securities in which an issuer promises specified payments at specified future dates, covering bonds, bills, notes, securitized products, and preferred stock.
Fixed Orthodontic Appliances
Fixed orthodontic appliances (braces) attach brackets to teeth with an arch wire to move teeth. From Fauchard's 1728 bandolet and Angle's Edgewise bracket to bonding, Ni-Ti wires, and self-ligating brackets.
Fixed point (mathematics)
A fixed point in mathematics, also called an invariant point, is a point that a function maps to itself, so Λ(x) = x; fixed point theorems give conditions for their existence.
Fixed stars
The fixed stars, or sphere of fixed stars, are the stars that keep the same positions relative to one another on the sky, unlike the wandering Sun, Moon, and planets.
Fixed subaortic stenosis
Fixed subaortic stenosis (subvalvular aortic stenosis, SAS): congenital fibromuscular or membranous obstruction of the left ventricular outflow tract below the aortic valve, usually presenting before age 10, treated by surgical resection with substantial recurrence risk.
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.
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-point arithmetic
Fixed-point arithmetic is a method of computing with real numbers by representing each value as an integer scaled by a fixed factor, with the radix point implicit.
Fixed-point combinator
The fixed-point combinator, known as the Y combinator, is a lambda calculus term Y satisfying Y f = f(Y f), supplying recursion in a language without named definitions.