Doppio in espresso

Espresso

Espresso is a concentrated beverage brewed by forcing a small amount of nearly boiling water under pressure through finely ground coffee. Espresso is widely known throughout the world....

 is a double shot

Shot glass

A shot glass is a small glass designed to hold or measure spirits or liquor, which is either drunk straight from the glass or poured into a mixed drink....

, extracted using a double filter basket in the portafilter

Portafilter

A portafilter attaches to the group head of semi-automatic and piston-driven espresso machines, and carries a tamped puck of coffee grounds within its basket. It is usually made of brass, and is attached by a plastic or wooden handle...

. This results in 60ml of drink

Drink

A drink, or beverage, is a liquid which is specifically prepared for human consumption. In addition to fulfilling a basic human need, beverages form part of the culture of human society.-Water:...

, double the amount of a single shot espresso. More commonly called a standard double, it is a standard in judging the espresso quality in barista

Barista

A barista is a person, usually a coffee-house employee, who prepares and serves espresso-based coffee drinks.- Application of the title :...

 competitions. Doppio is Italian

Italian language

Italian is a Romance language spoken mainly in Europe: Italy, Switzerland, San Marino, Vatican City, by minorities in Malta, Monaco, Croatia, Slovenia, France, Libya, Eritrea, and Somalia, and by immigrant communities in the Americas and Australia...

, meaning "double".

A single shot of espresso by contrast is called a solo, and developed because it was the maximum amount that could practically be extracted on lever espresso machines. Today the doppio is the standard shot, and because solos require a different filter basket, solo shots are often produced by making ("pulling") a doppio in a two-spout portafilter, but only catching one of the streams (the other stream may be discarded or used in another drink).