Fold, folding or foldable may refer to:

Arts, entertainment, and media

* ''Fold'' (album), the debut release by Australian rock band Epicure * Fold (poker), in the game of poker, to discard one's hand and forfeit interest in the current pot * Above the fold and below the fold, the positioning of news items on a newspaper's front page according to perceived importance * Paper folding, or ''origami'', the art of folding paper

Science, technology, and mathematics

Biology

* Protein folding, the physical process by which a polypeptide folds into its characteristic and functional three-dimensional structure ** Folding@home, a powerful distributed-computing project for simulating protein folding * Fold coverage, quality of a DNA sequence * Skin fold, an area of skin that folds

Computing

* Fold (higher-order function), a type of programming operation on data structures * fold (Unix), a computer program used to wrap lines to fit in a specified width * Folding (DSP implementation), a transformation technique using in DSP architecture implementation *

Folding (signal processing) In signal processing and related disciplines, aliasing is an effect that causes different signals to become indistinguishable (or ''aliases'' of one another) when sampled. It also often refers to the distortion or artifact that results when a ...

, an aspect of aliasing * Folding editor, a text editor that supports text folding or code folding, allowing the user to hide and reveal blocks of text * case folding is the conversion of letter case in a string * Constant folding, a compiler optimization technique * Folding@home, a powerful distributed-computing project for simulating protein folding

Electronics

* Foldable display * Flexible display

Other uses in science and mathematics

* Fold (geology), one or a stack of originally flat and planar surfaces that are bent or curved as a result of plastic deformation * Fold (higher-order function), in functional programming, fold refers to a family of higher-order functions that analyze a recursive data structure and through use of a given combining opera * Folding (chemistry), the process by which a molecule assumes its shape or conformation *

Folding (Dynkin diagram) In the mathematical field of Lie theory, a Dynkin diagram, named for Eugene Dynkin, is a type of graph with some edges doubled or tripled (drawn as a double or triple line). Dynkin diagrams arise in the classification of semisimple Lie algebras ...

, in Lie theory, a way of obtaining one Dynkin diagram from another *

Fold change Fold change is a measure describing how much a quantity changes between an original and a subsequent measurement. It is defined as the ratio between the two quantities; for quantities ''A'' and ''B'' the fold change of ''B'' with respect to ''A'' ...

, a measure of the difference between two quantities * e-folding, exponential growth or decay * Polygon folding, or polyhedron folding

Other uses

* Amicus Therapeutics, NASDAQ stock trading symbol FOLD * Book folding, in book production * Foldable smartphone, a smartphone with a folding form factor * Folding bicycle, a bicycle designed to fold into a compact form * Folding clothes, allows apparel to be stored compactly, prevents unwanted creasing, preserves wanted creases, and presents them in a pleasing manner, for instance when displayed on sale in stores * Pen (enclosure), or sheep fold, a sheep pen in British English * Samsung Galaxy Fold, a smartphone *

Scottish Fold The Scottish Fold is a breed of domestic cat with a natural dominant gene mutation that affects cartilage throughout the body, causing the ears to "fold", bending forward and down towards the front of the head, which gives the cat what is o ...

, a cat breed