The Isetta is an Italian

Italy

Italy , officially the Italian Republic languages]] under the European Charter for Regional or Minority Languages. In each of these, Italy's official name is as follows:;;;;;;;;), is a unitary parliamentary republic in South-Central Europe. To the north it borders France, Switzerland, Austria and...

-designed microcar

Microcar

A microcar is the smallest automobile classification usually applied to standard small car . Such small cars were generally referred to as cyclecars until the 1940s. More recent models are also called bubblecars due to their egg-shaped appearance.-Definition:The definition of a microcar has varied...

 built in a number of different countries, including Spain

Spain

Spain , officially the Kingdom of Spain languages]] under the European Charter for Regional or Minority Languages. In each of these, Spain's official name is as follows:;;;;;;), is a country and member state of the European Union located in southwestern Europe on the Iberian Peninsula...

, Belgium

Belgium

Belgium , officially the Kingdom of Belgium, is a federal state in Western Europe. It is a founding member of the European Union and hosts the EU's headquarters, and those of several other major international organisations such as NATO.Belgium is also a member of, or affiliated to, many...

, France

France

The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

, Brazil

Brazil

Brazil , officially the Federative Republic of Brazil , is the largest country in South America. It is the world's fifth largest country, both by geographical area and by population with over 192 million people...

, Germany

Germany

Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...

, and the United Kingdom

United Kingdom

The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

. Produced in the post-World War II

World War II

World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

 years, a time when cheap short-distance transportation was most needed, it became one of the most successful and influential city car

City car

A city car is a small car intended for use primarily in an urban area.City cars are sold worldwide and most automotive industry manufacturers have one or two in their line-up. In North-America city cars are often referred to simply as "subcompacts" alongside the superminis. These kind of cars...

s ever created. Because of its egg shape and bubble-like windows, it became known as a bubble car

Bubble car

Bubble car is a subjective term used for some small, economical automobiles, usually produced in the 1950s and 1960s.- Varieties :The Messerschmitt KR175 and KR200, and the FMR Tg500, had aircraft-style bubble canopies, giving rise to the term bubble car to refer to all these post-war microcars...

, a name later given to other similar vehicles, including the AMC Pacer

AMC Pacer

The AMC Pacer is a two-door compact automobile produced in the United States by the American Motors Corporation between 1975 and 1980.Its initial design idea was started in 1971. The car's unusual rounded shape with massive glass area greatly contrasted with the three-box architecture with "square,...

.

The BMW

BMW

Bayerische Motoren Werke AG is a German automobile, motorcycle and engine manufacturing company founded in 1916. It also owns and produces the Mini marque, and is the parent company of Rolls-Royce Motor Cars. BMW produces motorcycles under BMW Motorrad and Husqvarna brands...

 Isetta was in 1955 the world's first mass-production 3-Liters/100km

Fuel efficiency

Fuel efficiency is a form of thermal efficiency, meaning the efficiency of a process that converts chemical potential energy contained in a carrier fuel into kinetic energy or work. Overall fuel efficiency may vary per device, which in turn may vary per application, and this spectrum of variance is...

 car.In this context, 3-Liter refers not to engine size but to the fact that its low-friction 1-cylinder engine and low weight gave it a fuel efficiency of 3.3 L/100 km(manufacturer information).