This an instance when use of the "European" descriptor makes good sense;
9 x 25
9x23
9x21
9x19
9x18
9x17
etc, with the addition of rimless, or semi-rimmed, or rimmed.
9MM Japanese is a rimmed or "flanged" cartridge.
And since the ubiquitous .38 special is actually a 9mm along with the .357 magnum- the list can go on, and on!
