# Double

Double may refer to:

## People

• Baron Emile Double (1869-1938), a vigneron who established the vineyard at the Château de Beaupré in Saint-Cannat in 1890
• François-Joseph Double (1776-1842), a French physician
• Marie-Louise Double de Saint-Lambert (1891-1974), a French philanthropist later known as Countess Lily Pastré
• Steve Double, British Conservative Party politician, Member of Parliament (MP) for St Austell and Newquay since 2015

## 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 $x+yj$, where $j^2=+1$
• A 2-tuple, or ordered list of two elements, denoted $(a,b)$
• Double (manifold)
• Double (Java) is a type of variable which supports decimals or fractions 5 3/4 / 5.250 / 5 while integers only support full numbers

## Food and drink

• Doubles, a sandwich that is a common street food in Trinidad and Tobago
• 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