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).
Under STANAG 4090, it is a standard cartridge for NATO forces as well as many non-NATO countries.
The name Parabellum is derived from the Latin: Si vis pacem, para bellum ("If you seek peace, prepare for war"), which was the motto of DWM.
According to the 2014 edition of Cartridges of the World, the 9×19mm Parabellum is "the world's most popular and widely used military handgun and submachinegun cartridge." In addition to being used by over 60% of police in the U.S., Newsweek credits 9×19mm Parabellum pistol sales with making semiautomatic pistols more popular than revolvers. The popularity of this cartridge can be attributed to the widely held conviction that it is effective in police and self-defense use. Its low cost and wide availability contribute to the caliber's continuing popularity.

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