How many ounces are in a "double" shot?

A "double" shot typically refers to a serving of liquor that consists of two standard shots. Since a standard shot is generally recognized as 1 ounce, a double shot would therefore contain 2 ounces of liquor. This measurement is commonly used in bars and restaurants for mixed drinks or when serving spirits neat or on the rocks.

Thus, the correct answer to the question is that a double shot contains 2 ounces. This understanding is crucial for bartenders in ensuring proper measurements for alcoholic beverages, contributing to consistency and adherence to drink recipes, as well as managing customers' alcohol consumption responsibly.