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Foil may refer to: ;Materials * Foil (metal), a quite thin sheet of metal, usually manufactured with a rolling mill machine * Metal leaf, a very thin sheet of decorative metal * Aluminium foil, a type of wrapping for food * Tin foil, metal foil made of tin, the direct predecessor to aluminium foil * Plastic foil, a thin layer of plastic material * *Transparency (projection), as in "foil" (film over incandescent light) or "viewfoil" ;Fluid dynamics * Foil (fluid mechanics) * * Airfoil, a foil operating in air * * Hydrofoil, a foil operating in water * * Parafoil, a non-rigid airfoil, inflated during use * Foil bearing, a type of fluid bearing ;Arts and culture * Foil (architecture), decorative device derived from cusps of circles * Foil stamping, a printmaking technique * Foil (band), a Seattle-based grunge rock band c.1990 - 98 * Foil (fencing), one of the three weapons used in modern fencing * Foil (literature), a subsidiary character who emphasizes the traits of a main character * * A Comedic (or comic) foil, is the straight man in a comedy double act * Foil (song), "Weird Al" Yankovic's parody of Lorde's song "Royals" ;Mathematics * The FOIL method, a mnemonic to expand the product of two first-degree polynomials ("linear factors") ;Navigation * Hydrofoil, a type of high-powered motorboat that uses underwater foils to lift its hull above the water when moving at high speeds * Bruce foil, a foil used on an outrigger to prevent a boat from heeling * Centerboard, a movable keel that functions as a foil * Foilboard, a surfboard using a hydrofoil ;Other * People in a police lineup * First Order Inductive Learner - a rule-based learning algorithm * FOIL (programming language), either of two now-defunct computer programming languages * Forum of Indian Leftists, a political group of Indian intellectuals * Freedom of information legislation or Freedom of Information Law (FOIL) * Ultrasonic foil (papermaking), a type of high frequency vibrating foil involved in papermaking * Tally stick#Split tally, in ancient financial accounting, the part of a split tally stick given to the recipient in a transaction 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Foil」の詳細全文を読む スポンサード リンク
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