Quad as a word or

prefix A prefix is an affix which is placed before the Word stem, stem of a word. Adding it to the beginning of one word changes it into another word. For example, when the prefix ''un-'' is added to the word ''happy'', it creates the word ''unhappy'' ...

usually means 'four'. It may refer to:

Government

* Quadrilateral Security Dialogue, a strategic security dialogue between Australia, India, Japan, and the United States * Quadrilateral group, an informal group which includes the trade spokesmen of the United States, Japan, Canada, and the European Union * Quad Cities, a group of five cities straddling the boundary between the U.S. states of Iowa and Illinois * The "Quad", the senior members of the Cameron–Clegg coalition government in the United Kingdom from 2010 to 2015

Art and entertainment

Matthias Quad Matthias Quad (1557–1613) was an engraver and cartographer from Cologne. He was the first European mapmaker to use dotted lines to indicate international borders.Helmut Walser Smith, ''The Continuities of German History'' (Cambridge Unive ...

(1557–1613), engraver and cartographer * ''Quad'' (film), 2015 *

Quad (music) Quad or QUAD was the name of a solo music project by Gary Ramon. During his six-year hiatus from Sun Dial, Ramon embarked on an ambitious solo project, Quad, which combined ambient electronica with kraut rock. The result was a pair of self-tit ...

, a musical project by Gary Ramon * ''Quad'' (play), by Samuel Beckett * ''The Quad'' (TV series), 2017 * Quad (arts centre), in Derby, United Kingdom * Quad Cinema, art house in New York City, New York *

Quad (company) Quad (formerly Quad/Graphics) is an American commercial printing company which offers marketing strategy and management services, based in Sussex, Wisconsin. It was founded as a printing company on July 13, 1971, by Harry V. Quadracci. Since 20 ...

, formerly Quad/Graphics, an American printing company *

Quadruple combination The standard works of the Church of Jesus Christ of Latter-day Saints (LDS Church, the largest in the Latter Day Saint movement) are the four books that currently constitute its open scriptural canon. The four books of the standard works are: * T ...

, the four books that comprise the canon of the LDS church

Medicine and anatomy

* Quadriplegic, a person paralyzed in all four limbs * Quadriceps femoris, a large leg muscle group *

Quadruplets A multiple birth is the culmination of one multiple pregnancy, wherein the mother gives birth to two or more babies. A term most applicable to vertebrate species, multiple births occur in most kinds of mammals, with varying frequencies. Such bir ...

, four children from a multiple birth

Sports

* Quad (figure skating), a figure skating jump with four revolutions *

Quad scull A quadruple sculling boat, often simply called a quad and abbreviated 4x, is a rowing boat used in the sport of competitive rowing. It is designed for four people who propel the boat by sculling with two oars, or "sculls", one in each hand. Rac ...

, a boat configuration of four rowers * Quad skates, roller skates with two wheels on each of two axles * Quad, one of the divisions in

wheelchair tennis Wheelchair tennis is one of the forms of tennis adapted for wheelchair users. The size of the court, net height and rackets are the same, but there are two major differences from pedestrian tennis: athletes use specially designed wheelchairs, a ...

* Quadruple-double, a statistical accomplishment in basketball * Quadrennium, the 4-year training cycle between Olympic games

Transportation

* Quad bike or all-terrain vehicle, a vehicle that travels on low-pressure tires * Quad, a tandem bicycle with four seats * Quadracycle, a four-wheeled human-powered land vehicle * Jeffery Quad, a four-wheel drive truck * Quadcopter, a four-rotor helicopter * Quad, a

chairlift An elevated passenger ropeway, or chairlift, is a type of aerial lift, which consists of a continuously circulating steel wire rope loop strung between two end terminals and usually over intermediate towers, carrying a series of chairs. They ...

in skiing which carries four persons * Quad, or railroad speeder, a motorized vehicle used for maintenance on railroads * Quad (rocket), an autonomous rocket by Armadillo Aerospace

Technology

QUAD (cipher) In cryptography, the QUAD, cipher is a relatively new stream cipher, which was designed with provable security arguments in mind. Description QUAD relies on the iteration of a randomly chosen multivariate quadratic system S=(Q1, ..., Qm) of m=kn ...

, a stream cipher *

QUaD Quad as a word or prefix usually means 'four'. It may refer to: Government * Quadrilateral Security Dialogue, a strategic security dialogue between Australia, India, Japan, and the United States * Quadrilateral group, an informal group which inc ...

, a microwave telescope at the South Pole *

Quad antenna A quad antenna is a type of directional wire radio antenna used on the HF and VHF bands. Like a Yagi–Uda antenna ("Yagi"), a quad consists of a driven element and one or more parasitic elements; however in a quad, each of these elements is ...

, a directional antenna * Quad Electroacoustics, a British manufacturer of audio equipment *

Quadraphonic sound Quadraphonic (or quadrophonic and sometimes quadrasonic) sound – equivalent to what is now called 4.0 surround sound – uses four audio channels in which speakers are positioned at the four corners of a listening space. The system allows for th ...

, four-channel sound * Quadruplex videotape, video tape format *

Quad Flat Package A quad flat package (QFP) is a surface-mounted integrated circuit package with "gull wing" leads extending from each of the four sides. Socketing such packages is rare and through-hole mounting is not possible. Versions ranging from 32 to 304 ...

, a type of package for surface mounted integrated circuit *

Star quad cable Star-quad cable is a four-conductor cable that has a special quadrupole geometry which provides magnetic immunity when used in a balanced line. Four conductors are used to carry the two legs of the balanced line. All four conductors must be an ...

, four insulated conductors twisted together

Other uses

Quad (unit) A quad is a unit of energy equal to (a short-scale quadrillion) BTU, or (1.055 exajoules or EJ) in SI units. The unit is used by the U.S. Department of Energy in discussing world and national energy budgets. The global primary energy prod ...

, unit of energy, short for ''quadrillion'', 10¹⁵ BTU *

Quadrangle (architecture) In architecture, a quadrangle (or colloquially, a quad) is a space or a courtyard, usually rectangular (square or oblong) in plan, the sides of which are entirely or mainly occupied by parts of a large building (or several smaller buildings). T ...

, a space or courtyard bordered by buildings *

Quad (geography) A "quadrangle" is a topographic map produced by the United States Geological Survey (USGS) covering the United States. The maps are usually named after local physiographic features. The shorthand "quad" is also used, especially with the name of t ...

, a United States Geological Survey topographical map * Quad (typography), a spacer used in letterpress type * Quadrilateral, in geometry * Quad poster, a common UK size of

film poster A film poster is a poster used to promote and advertise a film primarily to persuade paying customers into a theater to see it. Studios often print several posters that vary in size and content for various domestic and international markets. The ...

* Quadrat, in ecology, a small study area or a frame used to define it * Quadrupel, a Belgian beer * The Quad Resort and Casino, on the Las Vegas Strip * Four-of-a-kind in poker