What does the presence of an "e" in "whiskey" indicate?

The presence of an "e" in "whiskey" is indicative of its country of origin, specifically that it refers to whiskey produced in Ireland or the United States. In contrast, Scotch whisky from Scotland omits the "e." This distinction has historical roots in the different production traditions and regulations between countries. The spelling thus serves as a marker for consumers to identify where the spirit comes from, navigating through the diverse world of whiskey and whisky.