Harley Davidson, abbreviated H-D or Harley, an American motorcycle manufacturer. Now you can bring the spirit of Harley Davidson Signs to your home, garage, game room or wherever with these officially licensed signs. Harley-Davidson motorcycles (AKA "Harleys") have a distinctive design and exhaust note. They are especially noted for the tradition of heavy customization that gave rise to the chopper style of motorcycle. Choose from Porcelain, embossed tin or metal street signs.