Espresso (Simply a Caffe' in Italy): Small amount (1 to 1.5 oz) of dark, rich coffee. Traditionally served in a 3 oz or smaller, pre-warmed demitasse cup. NOTE: Lemon peels, while commonly served with Espresso in America, are not a typical accompaniment in Italy. Espresso with a lemon peel on the side is sometimes called Espresso Romano.
Doppio: Double Espresso (twice the amount of coffee and twice the amount of water. Basically, two shots of espresso in one cup).
Ristretto (Literally, Shrunk or Short): More concentrated espresso - made using the same amount of coffee but less water, as little as 0.5 oz per serving, by shortening extraction time.
Espresso Lungo Cup Drawing