How many names for 9mm? When is 9mm really 380?

Different naming conventions and the passage of time have created some confusing situations when it comes to caliber names. 9mm Luger and 380ACP can be particularly confusing because in many areas of the world they're both called 9mm and no one is wrong.
380ACP, 380 auto, 9mm Browning Short, 9mm Court, 9mm Corto, 9mm Kurtz, 9x17
9mm Luger, 9mm Parabellum, 9x19, 9mm NATO

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