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9
noun
Gun, 9mm Firearm;
“9” or “nine” usually refers to a gun using 9mm cartridges, (eg. M9, Kahr S9, Ruger SR9, Heckler and Koch VP9, FMG-9, etc.), but more loosely to refer to any firearm. It’s a coded way to mention weapons without saying the full word directly, borrowed from wider rap culture but used within UK street contexts.