Double

Double, The Double or Dubble may refer to:

Mathematics and computing

Multiplication by 2
Double precision, a floating-point representation of numbers that is typically 64 bits in length
A double number of the form $x+yj$ , where $j^{2}=+1$
A 2-tuple, or ordered list of two elements, commonly called an ordered pair, denoted $(a,b)$
Double (manifold), in topology

Double, action in games whereby a competitor raises the stakes
- double, in contract bridge
- Doubling cube, in backgammon
- Double, doubling a blackjack bet in a favorable situation
- Double, a bet offered by UK bookmakers which combines two selections
Double, villain in the video game Mega Man X4
A kart racing game Mario Kart: Double Dash
An arcade action game Double Dragon

Double (association football), the act of a winning a division and primary cup competition in the same season
Double (baseball), a two-base hit in baseball
- The Double (Seattle Mariners), Edgar Martinez's walk-off double in Game 5 of the 1995 American League Division Series
Double (cricket), the feat of scoring a thousand first-class runs and taking a hundred first-class wickets in a single season
Double (volleyball), scoring ten or more in a statistical category (aces, kills, blocks, digs, or assists) in a single match
Double (Gaelic games), the act of winning the All-Ireland Senior Football Championship and the All-Ireland Senior Hurling Championship in the same year
Double (rugby league), winning the Super League and Challenge Cup in one season
Double-double (basketball), accumulating ten or more in two key statistical categories – points, rebounds, assists, steals, and blocked shots – in a single game
Double Duty, competing in the Indianapolis 500 and Coca-Cola 600 on the same day or weekend.

Double (filmmaking), someone who substitutes for the credited actor of a character
The Double (1934 film), a German crime comedy film
The Double (1963 film), a British film, part of the Edgar Wallace Mysteries series
The Double (1971 film), an Italian film
The Double (2011 film), a spy thriller film
The Double (2013 film), a film based on the Dostoevsky novella
Kamen Rider Double, a 2009–10 Japanese television series
- Kamen Rider Double (character), the protagonist in a Japanese television series of the same name

Double album, audio album spanning two units of the primary medium in which it is sold, typically records and CDs
Double variation, a variation form in music
Double (band), a Swiss pop duo
Double (singer) (born 1975), a Japanese R&B singer
Double (Roch Voisine album) (1990)
Double (Zhao Wei album) (2005)
"Double" (BoA song) (2003)
"Double", a song by Blackbear from Digital Druglord (2017)
"Double", by Yeat from 2 Alive (2022)
"The Double", an instrumental by Clint Mansell from the Black Swan soundtrack (2010)
The Double Violin Concerto (Bach) in D minor, BWV 1043, commonly referred to as "The Double" among violinists

Baron Emile Double (1869–1938), vigneron who established the vineyard at Château de Beaupré
François-Joseph Double (1776–1842), French physician
Marie-Louise Double de Saint-Lambert (1891–1974), French philanthropist later known as Countess Lily Pastré
Steve Double (born 1966), British politician and Member of Parliament

Double, also called a look-alike or doppelgänger, one person or being that resembles another
Polish Enigma double, a machine replicating the function of Nazi Germany's cipher machines
Double, a former fraction of the Guernsey pound
Double, a former rank of liturgical feast in the Roman Rite of the Catholic Church
Dubbel, a strong Belgian Trappist beer or, more generally, a strong brown ale
A double, a shorthand for an instance of double tradition, verses duplicated in the Biblical gospels of Matthew and Luke