Foil

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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 or tinfoil, metal foil made of tin, the direct predecessor to aluminium foil
• Plastic foil, a thin layer of plastic material

Fluid dynamics (including aerodynamics)

• Airfoil, used on powered aircraft of all kinds
• Foil bearing, a type of fluid bearing
• Hydrofoil, an underwater foil used to lift a certain king of rapidly moving motorboat. Or otherwise, a common term used for that entire motorboat, from bow to stern.
• Parafoil, a nonrigid airfoil, inflated during use

Arts and culture

• Foil stamping, a printmaking technique
• Foil (band), a Seattle-based grunge rock band c.1990 - 98.
• Foil (literature), a subsidiary character who emphasizes the traits of a main character. A technique also used in plays and motion pictures
  • A Comedic (or comic) foil, is the straight man in a comedy double act.
• "Film Over Incandescent Light", a picture-projection method

Mathematics

• The FOIL method, a way 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

• First Order Inductive Learner - a rule-based learning algorithm.
• FOIL (programming language), one of two now-defunct computer programming languages
• Foil (fencing), one of the three weapons used in modern fencing
• FOIL - a bit of corporate jargon used within IBM in the past to refer to overhead presentation sheets. See "Film Over Incandescent Light" above. Some IBM employees still use the term to this day, even to refer to electronic presentations.
• Freedom of information legislation or Freedom of Information Law (FOIL)

Little-known techniques in papermaking

• Foil (papermaking), a type of ving under the wire in the wire section of a paper machine creating a vacuum pulse to eliminate water from the stock (fibre/water slurry).
• Ultrasonic foil (papermaking), a type of high frequency vibrating foil under the wire, creating cavitation, imploding vacuum bubbles, in the stock on the wire. The shock waves from the imploding bubbles will distribute the fibres more uniform in the paper web and this will give a stronger paper

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Noun

foil (countable and uncountable; plural foils)

1. A very thin sheet of metal.
2. (uncountable) Thin aluminium/aluminum (or, formerly, tin) used for wrapping food.
3. A thin layer of metal put between a jewel and its setting to make it seem more brilliant.
4. (figuratively) In literature, theatre/theater, etc, a character who helps emphasize the traits of the main character.
5. (figuratively) Anything that acts to emphasise the characteristics of something.
6. (fencing) A very thin sword with a blunted (or foiled) tip
7. A thin, transparent plastic material on which marks are made and projected for the purposes of presentation. See transparency.
8. (heraldry) A stylized flower or leaf.
9. Shortened form of hydrofoil.
10. Shortened form of aerofoil/airfoil.

Synonyms

• (thin aluminium/aluminum): aluminium foil, silver foil, silver paper, tin foil

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