In general when we talk about 9mm ammo and pistols we're talking about: 9mm Luger, 9mm Parabellum, 9mmP, 9x19mm, 9mm NATO and 9mm x 19.
9x19mm = 9mm (.355) dia. bullet and a 19mm case length.
There are many other "9mm" cartridges too. 9mm Largo, 9mm Bergman-Bayard. 9mm Makarov (9x18mm using nominal .363 dia. bullets), 9mm Federal (9x19mm Rimmed), 9mm Win Mag, 9mm Short/Kurz/Corto (.380 Auto), 9mm Jap (revolver) and even 9mm Rimfire/Flobert (shotshells for single shot pistols/rifles/cane guns) to name a few.
Note: Some people may think that 9mm NATO is a separate cartridge but it is not. It is just a different loading (like +P and +P+) in the same 9x19mm cartridge.
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