The Rocks Glass is known by several names - depending on where you are in the country and in which Cocktail lounge you are in. It can be referred to as "An Old Fashioned", a "Tumbler", a "Whiskey" glass or even a "Low Ball" glass. This is a small glass with usually two or three ingredients only.
So called 'rocks' as they drink in this glass will contain invariably 'ice cubes'.
Used for:
Small drinks usually (but not always) mixed in the glass.