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 Above the fold is the upper half of the front page of a newspaper or tabloid where an important news story or photograph is often located. Papers are often displayed to customers folded so that only the top half of the front page is visible. Th ...

and below the fold, the positioning of news items on a newspaper's front page according to perceived importance *

Paper folding ) is the Japanese paper art, art of Paper folding (disambiguation), paper folding. In modern usage, the word "origami" is often used as an inclusive term for all folding practices, regardless of their culture of origin. The goal is to trans ...

, or ''origami'', the art of folding paper

Science, technology, and mathematics

Biology

Protein folding Protein folding is the physical process by which a protein, after Protein biosynthesis, synthesis by a ribosome as a linear chain of Amino acid, amino acids, changes from an unstable random coil into a more ordered protein tertiary structure, t ...

, the physical process by which a polypeptide folds into its characteristic and functional three-dimensional structure **

Folding@home Folding@home (FAH or F@h) is a distributed computing project aimed to help scientists develop new therapeutics for a variety of diseases by the means of simulating protein dynamics. This includes the process of protein folding and the movements ...

, 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 Sanger sequencing#Method, chain-termination method of DNA sequencin ...

, quality of a DNA sequence *

Skin fold Skin folds or skinfolds are areas of skin that are naturally folded. Many skin folds are distinct, heritable anatomical features, and may be used for identification of animal species, while others are non-specific and may be produced either by in ...

, an area of skin that folds

Computing

Fold (higher-order function) In functional programming, fold (also termed reduce, accumulate, aggregate, compress, or inject) refers to a family of higher-order functions that analyze a recursive data structure and through use of a given combining operation, recombine the re ...

, 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), 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 Constant folding and constant propagation are related compiler optimizations used by many modern compilers. An advanced form of constant propagation known as sparse conditional constant propagation can more accurately propagate constants and sim ...

, a compiler optimization technique *

, a powerful distributed-computing project for simulating protein folding

Electronics

* Foldable display *

Flexible display A flexible display or rollable display is an electronic visual display which is flexible in nature, as opposed to the traditional Flat panel display, flat screen displays used in most electronic devices. In recent years there has been a growing ...

Other uses in science and mathematics

Fold (geology) In structural geology, a fold is a stack of originally planar surfaces, such as sedimentary rock, sedimentary stratum, strata, that are bent or curved (''"folded"'') during permanent deformation (engineering), deformation. Folds in rocks vary i ...

, one or a stack of originally flat and planar surfaces that are bent or curved as a result of plastic deformation *

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 specific ...

, the process by which a molecule assumes its shape or conformation * Folding (Dynkin diagram), 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 or decreases 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 at ...

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

Other uses

Amicus Therapeutics Amicus Therapeutics, Inc. 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 wou ...

, NASDAQ stock trading symbol FOLD *

Book folding Book folding is the stage of the book production process in which the pages of the book are folded after printing and before binding. The folding process is also necessary to produce print products other than books—for instance mailings, magazin ...

, 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 (mobile phones), form factor. While the foldable design has been incorporated before in clamshell design, clamshell (or "flip pho ...

, a smartphone with a folding form factor *

Folding bicycle A folding bicycle is designed to be compacted into a smaller, more manageable size or shape, making it easier to store or carry . When folded, the bikes can be more easily carried into buildings, on public transportation (facilitating mixed-mo ...

, a bicycle designed to fold into a compact form * Folding bridge, a bridge that can be folded, mainly to open for higher boats *

Folding clothes Clothing (also known as clothes, garments, dress, apparel, or attire) is any item worn on a human body. Typically, clothing is made of fabrics or textiles, but over time it has included garments made from animal skin and other thin sheets of mat ...

, 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) A pen is a fenced/ walled open-air enclosure for holding land animals in captivity, typically for livestock but may also be used for holding other domesticated animals such as pets that are unwanted inside buildings. The term describes ty ...

, or sheep fold, a sheep pen in British English * -fold, a feature in British toponymy * Samsung Galaxy Fold, a smartphone *

Scottish Fold The Scottish Fold is a distinctive List of cat breeds, breed of Cat, domestic cat characterised by a natural Dominance (genetics), dominant gene mutation associated with osteochondrodysplasia. This genetic anomaly affects cartilage throughout t ...

, a cat breed