alchol by volume: Alcohol content expressed as percentage of total volume; called “proof” in U.S. aperitif: Alcoholic beverage that stimulates appetite, e.g. sherry aroma: Smell of wine or spirit back: Term used to identify one drink in multi-drink order, e.g. “gin back” may identify gin drink closest to bartender. back bar: Area behind bar used for liquor bottles, displays and glassware. bar br..