What does M500 stand for?

M500 typically refers to a specific model of a firearm, particularly the Smith & Wesson M500, which is a powerful revolver chambered for the .500 S&W Magnum cartridge. It is known for its high stopping power and is often used for big game hunting and bear defense. The "M" stands for "model," while "500" denotes the caliber of the cartridge it fires.