# Double

A double is a look-alike or doppelgänger; one person or being that resembles another.

Double, The Double or Dubble may also refer to:

## Food and drink

• Doppio, a double shot of espresso
• Dubbel, a strong Belgian Trappist beer or, more generally, a strong brown ale
• A drink order of two shots of hard liquor in one glass
• A "double decker", a hamburger with two patties in a single bun

## Mathematics and computing

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

## People

• 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 Conservative Party politician, Member of Parliament (MP) for St Austell and Newquay since 2015

## Sports

• Double (association football), the act of a winning a division and primary cup competition in the same season
• Double scull, a two-man sculling boat raced in the sport of rowing
• Double (baseball), a two-base hit in baseball
• 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-double (basketball), accumulating ten or more in two of five statistical categories (points, rebounds, assists, steals, or blocks) in a single game
• Double Duty, a driver attempting to compete in the Indycar Indianapolis 500 and NASCAR Coca-Cola 600 on the same day
• The Double (Gaelic games), the act of winning the All-Ireland Senior Football Championship and the All-Ireland Senior Hurling Championship in the same year
• The Double (rugby league), winning the Super League and Challenge Cup in one season