Foil
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Foil can mean:
- In chemistry, a thin sheet of metal; see foil (chemistry).
- In fencing, a type of practice weapon; see foil (sword).
- In boating, an underwater airfoil like structure, such as a centreboard, or a hydrofoil boat.
- In aeronautics, an airfoil is a type of wing or blade.
- Aluminium foil, a type of wrapping for food.
- In literature, a type of character; see foil (literature).
- In computer science, FOIL was the name of two old programming languages.
- In algebra (mathematics), the FOIL rule is a mnemonic (memory device) for remembering how to multiply two binomials (polynomial with two terms).