I gotta admit, I've had my share of ND's, but I always keep it pointed in a (relatively) safe direction, away from things I really don't want to put holes in.
.38 Caliber. It's the same width, but different lengths of it. There's 9x19 Luger (which is what most people think of when they hear 9mm), 9x18 Makarov (which is my preferred carry), .38 Special, and .380 ACP (which is basically 9mm for babies).