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Fold (higher-order function)
Fold, also called reduce, is a higher-order function that combines the elements of a data structure into a single result, as in the left and right variants foldl and foldr.
Folded cascode
A folded cascode is an amplifier topology in which the cascode transistor is of the opposite type, folding the signal current into a separate branch.
Folded unipole antenna
A folded unipole antenna is a vertical radiating structure, usually an AM broadcast tower, grounded at the base and fed through parallel skirt wires connected at the top.
Folding bicycle
A folding bicycle is a bicycle whose frame, handlebars, and pedals collapse into a compact package for carrying on trains, buses, and in cars, usually with 16 or 20 inch wheels.
Folding boxboard
Folding boxboard (FBB) is a multi-ply cartonboard with a bulky mechanical pulp core between bleached chemical plies, giving high stiffness at low weight for folding cartons.
Folland Gnat
The Folland Gnat, later built as the Hawker Siddeley Gnat, is a British lightweight jet aircraft that trained RAF pilots and fought for India in the 1965 and 1971 wars.
Follo Line
The Follo Line (Follobanen) is a 22 km double-track railway in Norway running from Oslo S to Ski, opened in December 2022 and halving journey times to 11 minutes.
Follow-up time
Follow-up time, also called follow-up headway or move-up time, is a traffic engineering gap acceptance parameter: the time between successive queued minor-street vehicles entering the same major-street gap.
Folly
A folly, or architectural folly, is a building constructed chiefly for a landscape idea, association, or view rather than practical use, common in 18th-century English gardens and parks.
Folsom Dam
Folsom Dam is a 340-foot concrete gravity dam on the American River near Folsom, California, completed in 1956 to control floods and store water for Sacramento.
Folsom Lake
Folsom Lake is a reservoir on the American River northeast of Sacramento, California, created by Folsom Dam in 1956 for flood control, water storage, and recreation.
Fomento de Construcciones y Contratas
Fomento de Construcciones y Contratas (FCC) is a Spanish construction and services group in Madrid, working in environmental services, water, and infrastructure, controlled by Carlos Slim.
Fong Der power station
Fong Der power station, also romanized Fengde, is a natural gas-fired power plant in Shanshang District, Tainan, Taiwan, operated by Sun Ba Power Corporation and selling its output to Taipower.
Fonotipia
Fonotipia was an Italian record label and record company founded in Milan in 1904 by Baron Frederic d'Erlanger, expressly for recording opera singers, and absorbed by Odeon after 1925.
Font
A font is a set of characters sharing one design, historically one size of metal type and today a digital file mapping character codes to glyphs.
Font family (HTML)
Font family in HTML is the named set of typefaces a document requests for text, set through the CSS font-family property as a prioritized list.
Fontainebleau Miami Beach
Fontainebleau Miami Beach is a luxury resort hotel designed by Morris Lapidus, opened in 1954 and listed on the National Register of Historic Places in 2008.
Fontana Dam
Fontana Dam is a 480-foot hydroelectric dam on the Little Tennessee River in western North Carolina, built by the Tennessee Valley Authority during World War II to power aluminum production.
Fontana dei Quattro Fiumi
The Fontana dei Quattro Fiumi, or Fountain of the Four Rivers, is a Baroque fountain by Bernini at the center of Piazza Navona in Rome.
Fontana dell'Acqua Felice
The Fontana dell'Acqua Felice, also called the Fountain of Moses, is a monumental fountain in Rome built in 1587 as the terminal of the Acqua Felice aqueduct.
Fontenelle Dam
Fontenelle Dam is an earthfill dam on the Green River in Wyoming, completed in 1964 and best known for a near-failure from seepage in 1965.
Fonts on Macintosh
Fonts on Macintosh covers the typeface formats and rendering tools Apple has used since 1984, moving from Susan Kare's bitmap fonts to TrueType in 1991 and OpenType today.
Foo fighter
Foo fighters were unexplained glowing objects, often red or orange balls of light, that Allied pilots reported beside their aircraft on night missions over Europe in late 1944 and 1945.
Foobar
Foobar is a placeholder name in programming, formed from foo and bar, the two most common metasyntactic variables, used in example code and documentation since the early 1970s.
Food delivery
Food delivery, also called meal delivery service, brings prepared meals from restaurants to customers, ordered by phone, website, or mobile app and carried by couriers or gig workers.
Food industry in China
The food industry in China, one of the world's largest, transforms farm output into packaged and prepared food; food processing alone was valued at $1.26 trillion in 2024.
Food industry in India
The food industry in India is one of the world's largest food processing sectors, contributing 7.66% of manufacturing output and employing 12.41% of the organized manufacturing workforce in fiscal 2023.
Food preservation
Food preservation, also called food conservation, is the set of treatments that extend the shelf life of fresh foods and prevent spoilage by harmful bacteria.
Food storage container
A food storage container is a lidded vessel used to hold food in a refrigerator, freezer, or pantry, typically made of glass, plastic, stainless steel, or silicone.
Food-grade lubricant
A food-grade lubricant is a lubricant formulated so incidental contact with food does not adulterate it, built from ingredients cleared under FDA regulation 21 CFR 178.3570.