One is a typo -- there's no 'i' in parabellum. Both probably refer to the same cartridge:
9mm Luger -- Named for the creator of the cartridge: Georg Luger
9mm Parabellum -- From Latin: "Si vis pacem, para bellum" (If you seek peace, you must prepare for war). In WW2, it was the motto for the German War Department.
9mm Para - Short for 9mm Parabellum
9x19mm -- An international standard way to define metric cartridges. The first number refers to the bullet diameter. The second refers to case length.
9mm NATO -- NATO countries have standardized on 9x19mm as the standard cartridge for sidearms.
9 mil/ 9mike/ 9mm -- not specifically correct, since there are other cartridges that use a 9mm bullet, but since 9x19mm is the most popular one, when someone refers to "9 millimeter," they usually mean this cartridge. All of these are short form variations on this.
They are the same round. The "official" name is 9x19mm Parabellum, but it is also known as 9mm Luger, 9x19mm, 9x19, and simply "9mm".
Jack is mistaken about 9mm Luger being only standard-pressure 9x19mm Parabellum rounds, and not high-pressure (+P or +P+) rounds. The two terms are synonymous; they are the same thing. +P and +P+ are just higher-than-standard pressure rounds, and they may be listed by the manufacturer as either 9mm Luger or 9mm Parabellum.
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One is a typo -- there's no 'i' in parabellum. Both probably refer to the same cartridge:
9mm Luger -- Named for the creator of the cartridge: Georg Luger
9mm Parabellum -- From Latin: "Si vis pacem, para bellum" (If you seek peace, you must prepare for war). In WW2, it was the motto for the German War Department.
9mm Para - Short for 9mm Parabellum
9x19mm -- An international standard way to define metric cartridges. The first number refers to the bullet diameter. The second refers to case length.
9mm NATO -- NATO countries have standardized on 9x19mm as the standard cartridge for sidearms.
9 mil/ 9mike/ 9mm -- not specifically correct, since there are other cartridges that use a 9mm bullet, but since 9x19mm is the most popular one, when someone refers to "9 millimeter," they usually mean this cartridge. All of these are short form variations on this.
9mm Luger refers to standard 9 x 19 mm parabellum ammunition.
However, the new, high power 9 x 19 mm parabellum (also known as +P+) is not referred to as Luger (as he didn't develop it).
So Luger is effectively a sub-set of parabellum. Any 9 x 19 with an energy of over 700J give or take isn't a Luger.
Hope this helps
No difference. Georg Luger invented the 9mm parabellium. Just synonyms.
They are the same round. The "official" name is 9x19mm Parabellum, but it is also known as 9mm Luger, 9x19mm, 9x19, and simply "9mm".
Jack is mistaken about 9mm Luger being only standard-pressure 9x19mm Parabellum rounds, and not high-pressure (+P or +P+) rounds. The two terms are synonymous; they are the same thing. +P and +P+ are just higher-than-standard pressure rounds, and they may be listed by the manufacturer as either 9mm Luger or 9mm Parabellum.