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Foil may refer to: Wikipedia does not have an article with this exact name. ... Wiktionary is a multilingual, Web-based project to create a free content dictionary, available in over 150 languages. ...

• Metal leaf, a thin sheet of metal
• Aluminium foil, a type of wrapping for food
• Plastic foil, a thin layer of plastics
• Foil (fencing), one of the three weapons used in modern fencing
• Foil (literature), a character who emphasizes the traits of a main character
• Comedic foil, (or comic foil), is the straight man in a comedy team.
• Foil (fluid mechanics), a type of wing or blade used to provide lift
• Foil bearing, a type of fluid bearing
• FOIL (acronym for Film Over Incandescent Light), an image projection technique

In aeronautics: Photo courtesy Auntie P. Metal leaf, or leafing, is a thin foil of some nearly pure metal often gold or silver, and somtimes copper. ... Aluminium foil (Aluminum foil in North American English) is aluminium prepared in thin sheets (on the order of 0. ... An Italian-grip foil A foil is a type of weapon used in fencing. ... In the broadest possible sense, fencing is the art and science of armed combat involving cutting, stabbing, or bludgeoning weapons directly manipulated by hand, rather than shot or thrown (in other words, swords, knives, pikes, bayonets, batons, clubs, and so on). ... A foil character is either one who is opposite to the main character or nearly the same as the main character. ... A straight man is a role in a comedy double act where a performer works with a comedian by setting up the situations or feeding the lines that allow their partner to make a joke. ... A foil is a surface designed to maximize lift (force generated perpendicular to the fluid flow) while minimizing drag (force generated in the direction of the fluid flow) in a given range of conditions. ... Foil Bearing Foil bearings are a type of hydrodynamic bearing. ...

• Airfoil, used on aircraft
• Parafoil, a nonrigid airfoil, inflated during use

In navigation: An airfoil (in American English, or aerofoil in British English) is the shape of a wing or blade (of a propeller or ships screw or sail) as seen in cross-section. ... A parafoil is a nonrigid airfoil, designed with an aerodynamically inflated cell structure. ...

• Hydrofoil, a type of boat using foils designed for water
• Bruce foil, a foil used on an outrigger to prevent a boat from heeling
• Centreboard, a movable keel that functions as a foil
• Foilboard, a surfboard using a hydrofoil

Foil may also be: The Jetfoil Toppi is a ferry which connects Yakushima, Tanegashima Island and Kagoshima port in Japan. ... A Bruce foil is a variant of the leeboard, an arrangement to provide a sailing boat with resistance to sideways movement so that the sails will produce nearly forward movement under a variety of apparent wind directions. ... A centreboard is a form of movable keel on a small sailing boat or dinghy which can be moved to lower the draught (or depth) of the vessel. ... The Foilboard is a type of surfboard equipped with a hydrofoil that extends below the board, causing the board to completely lift out of the water at high speeds. ...

• FOIL programming language, one of two defunct computer programming languages
• FOIL rule, a mnemonic device for remembering how to multiply two binomials
• Foil (band), a Seattle grunge rock group c.1990-1996.

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