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 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, 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), 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, 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 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, 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