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.
Many copies of the original Philadelphia Deringer pistol were produced by other gun makers worldwide, and the name was frequently misspelled; this misspelling quickly became an alternative generic term for any pocket pistol, alongside the generic phrase palm pistol, which Deringer's competitors invented and utilized in their advertising.