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, the play largely centers on the act of betting, and as such, a protocol has been developed to speed up play, lessen confusion, and increase security while playing. Different games are played using different types of bets, a ...

, 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 Protein folding is the physical process by which a protein chain is translated to its native three-dimensional structure, typically a "folded" conformation by which the protein becomes biologically functional. Via an expeditious and reproduci ...

, 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 In genetics, shotgun sequencing is a method used for sequencing random DNA strands. It is named by analogy with the rapidly expanding, quasi-random shot grouping of a shotgun. The chain-termination method of DNA sequencing ("Sanger sequencing ...

, 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) Folding is a transformation technique using in DSP architecture implementation for minimizing the number of functional blocks in synthesizing DSP architecture. Folding was first developed by Keshab K. Parhi and his students in 1992. Its concept i ...

, 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 Code or text folding, or less commonly holophrasting, is a feature of some graphical user interfaces that allows the user to selectively hide ("fold") or display ("unfold") parts of a document. This allows the user to manage large amounts of text ...

, 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) In chemistry, folding is the process by which a molecule assumes its shape or conformation. The process can also be described as intramolecular self-assembly, a type of molecular self-assembly, where the molecule is directed to form a specifi ...

, 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 In science, ''e''-folding is the time interval in which an exponentially growing quantity increases by a factor of ''e''; it is the base-''e'' analog of doubling time. This term is often used in many areas of science, such as in atmospheric chem ...

, exponential growth or decay * Polygon folding, or polyhedron folding

Other uses

Amicus Therapeutics Amicus Therapeutics is a public American biopharmaceutical company based in Philadelphia, PA. The company went public in 2007 under the NASDAQ trading symbol FOLD. This followed a 2006 planned offering and subsequent withdrawal, which would have ...

, NASDAQ stock trading symbol FOLD * Book folding, in book production *

Foldable smartphone A foldable smartphone (also known as a foldable phone or simply foldable) is a smartphone with a folding form factor. Some variants of the concept use multiple touchscreen panels on a hinge, while other designs utilise a flexible display. Conce ...

, a smartphone with a folding form factor *

Folding bicycle A folding bicycle is a bicycle designed to fold into a compact form, facilitating transport and storage. When folded, the bikes can be more easily carried into buildings, on public transportation (facilitating mixed-mode commuting and bicycl ...

, 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