Foil

Foil may mean:

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• Foil (chemistry), a thin sheet of metal
• Aluminium foil, a type of wrapping for food
• Foil bearing, a type of fluid bearing
• Foil (sword), a weapon used in the sport of fencing
• Foil (fluid mechanics), a type of wing or blade used to provide lift
• In aeronautics:
• Airfoil, used on aircraft
• Parafoil, a nonrigid airfoil, inflated during use
• In sailing:
• Hydrofoil, a type of boat using foils designed for water
• Bruce foil, an 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 (literature), a character who emphasizes the traits of a main character, by comparison or contrast
• Comedic foil, (or comic foil), is the straight man in a comedy team.
• FOIL programming language, one of two defunct computer programming languages
• FOIL rule, a mnemonic device for remembering how to multiply two binomials