A rocks glass, also known as an old-fashioned glass, is a short tumbler used for serving whiskey or other spirits over ice. This type of glass is also commonly called a lowball glass. Some people may refer to it as a bucket glass, an old-school glass, or a short tumbler. Other synonyms for this type of glass include a whiskey glass, a low tumbler, or a double old-fashioned glass. The size and shape of a rocks glass make it perfect for enjoying spirits neat or on the rocks. With so many synonyms for this classic glass, what you call it may depend on where you're from or your personal preferences.