"The Terzerol (or terzerole) was a small muzzleloading pistol with one or two barrels. These firearms were used from the 17th century onward, first as flintlocks, ...
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and in the 19th century with percussion caps.
Due to its size, the weapon was also called a "pocket pistol" or "lady´s pistol", in contrast with the more common large handguns of the era. The term terzerol is derived from Italian." - (en.wikipedia.org 09.03.2020)