Harley-Davidson motorcycles are commonly referred to as "Harleys" or "Hogs." These terms have become synonymous with the brand and are widely used by motorcycle enthusiasts and the general public. "Harleys" is a more casual and colloquial term, while "Hogs" has its origins in the nickname given to Harley-Davidson motorcycles by members of the Harley Owners Group (HOG), an organization for Harley-Davidson motorcycle owners. Both terms are widely recognized and used to describe motorcycles produced by the Harley-Davidson Motor Company.