It is A 9mm- a 9mm Short. However, when most people say "9 mm" they mean the 9mm Parabellum, also known as 9mm Luger. That is a different cartridge than the .380.
Define better.
1 cm = 10 millimeter380 millimeter = 380/10 = 38 cm
It is forty nine thousandths of a millimeter.
The .380 automatic cannot shoot 9mm Parabellum ammo.
Forty-nine thousandths millimeter.
Zero point zero four nine millimeters.
That's how much the average fingernail grows in nine days.
A millimeter is a unit of length.
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