9×19mm Parabellum

The 9×19mm Parabellum is a firearms cartridge that was designed by Georg Luger and introduced in 1902 by the German weapons manufacturer Deutsche Waffen und Munitionsfabriken (DWM) (German Weapons and Munitions Factory) for their Luger semi-automatic pistol. For this reason, it is designated as the 9mm Luger by the Sporting Arms and Ammunition Manufacturers' Institute (SAAMI), and the 9 mm Luger by the Commission Internationale Permanente pour l'Epreuve des Armes à Feu Portatives (CIP).

Question: is there a difference between 9x19 and 9mm luger
Answer: no