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.
Various manufacturers around the world created numerous copies of the original Philadelphia Deringer pistol, and its name was often miswritten; this misspelling eventually became a common term for any pocket pistol, including the generic phrase palm pistol, which Deringer's rivals coined and promoted in their advertisements.