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The term "derringer" has come to refer to any small-sized handgun that is neither a revolver nor a semiautomatic pistol, although mini-revolvers are commonly called derringers.
The original Philadelphia Deringer was a single-shot muzzleloading percussion cap pistol introduced in 1852, by Henry Deringer. In total, approximately 15,000 Deringer pistols were manufactured. All were single barrel pistols with back action percussion locks, typically .41 caliber with rifled bores, and walnut stocks. Barrel length varied from 1.5" to 6", and the hardware was commonly a copper-nickel alloy known as "German silver".
The term "derringer" () has become a genericized misspelling of the last name of Henry Deringer. Many copies of the original Philadelphia Deringer pistol were made by other gun makers worldwide, and the name was often misspelled; this misspelling soon became an alternative generic term for any pocket pistol, along with the generic phrase palm pistol, which Deringer's competitors invented and used in their advertising. With the advent of metallic cartridges, pistols produced in the modern form are still commonly called "derringers".

Source: Wikipedia