There are several different types of 9mm cartridge. When Snoop Dogg or some other rapper talks about his "nine", they're referring to a weapon firing the 9x19 cartridge, also known as the 9mm Parabellum or 9mm Luger.
Other 9mm cartridges in common use include the 9x17, which is also known as the .380 ACP, and the 9x17 Makarov cartridge, which is popular with military surplus collectors.
There have been several other 9mm cartridges made, both past and present, to include the 9x23, 9x25, 9x39, etc.
Same round, different weapon design.
Different makers. The cartridge used is the 9x19.
None to really speak of. They are, for the most part, one and the same. The 9mm NATO is merely a variant of the 9mm Luger loaded for military specifications.
The 9mm Lugar round is longer than a .380 Caliber, which is also equal to 9mm in diameter. The overall cartridge and the bullet is larger and the case contains more powder. The 9mm Lugar is more powerful. BTW, the .40 cal Smith and Wesson is also called a 10mm. It is only 1mm larger in diameter and a little more powerful than a 9mm Lugar.
Glock is a brand. 9mm is a caliber size. So, there is no difference between a 9mm glock and a 9mm of another brand as far as caliber size.
No such ammuntion as 9mm rugger
Neither one exists, so there are no differences. However, there is a cartridge known as the 9mm Luger. It is chambered by many makers in pistols. Ruger is one of them.
9mm = .355 40 cal = .40
Case length.
There is no difference- Luger is a name that is commonly used in America and Parabelum is used in Europe, they are both 9x19.
9MM Luger can be Ball ammunition. Ball just means it is a jacketed round nose bellet.
The 9mm Parabellum is longer than the .380 ACP (also called the 9mm Short) They do not interchange.