Question: The Pirana was best known for styling an Italian car which was popularized for what?
Context: The Lancia 20/30 HP ("Tipo 58"), later known as Lancia Epsilon, is a passenger car produced by Italian car manufacturer Lancia between 1911 and 1912.  The car was quite similar to the previous 20/30 HP Delta model.  In total 357 were made. The Alfa Romeo 1900 C52 "Disco Volante", commonly known simply as Alfa Romeo Disco Volante (Italian for "Flying Saucer"), is a series of experimental sports racing cars produced between 1952 and 1953 by Italian car manufacturer Alfa Romeo in collaboration with Milanese coachbuilder Carrozzeria Touring.  The car was distinguished by streamlined, wind tunnel tested bodywork. The Bertone Pirana (or Jaguar Pirana) (not "Piranha" as some sources have it, although the badge on the rear of the car reads Piranha ) was a concept car created by Bertone for the 1967 London Motor Show at Earl's Court.  The sleek GT car was based on the chassis and powertrain of the 4.2 litre Jaguar E-type but was re-bodied with a unique steel monocoque body and luxurious interior.  The Pirana was designed by Marcello Gandini, perhaps best known for styling the Lamborghini Countach.  Unusually for a show car, the Pirana was commissioned as a publicity stunt by the Daily Telegraph, a leading British daily newspaper, as an example of an "ideal car."  The car was originally registered "TGF 1F".  After a successful showing at the London Motor show, the Pirana was subsequently exhibited at the New York City car show and then at the British Motor Show in Montreal. The Alfa Romeo 2000 (officially known as "Tipo 102", Italian for "Type 102") is a luxury car produced by Italian car manufacturer Alfa Romeo between 1958 and 1962, as a successor to the 1900 Super.  It was replaced in 1962 by the Alfa Romeo 2600. Marcello Gandini (born 26 August 1938) is an Italian car designer, known for his work with the automotive design house Gruppo Bertone, including his design of the Lamborghini Countach.  Gandini, along with noted Italian car designers Giorgetto Giugiaro and Leonardo Fioravanti, were all born in 1938, within months of each other. The Alfa Romeo 1900 M (better known by its nickname Alfa Romeo Matta, meaning "mad") is a four-wheel drive utility vehicle produced by Italian car manufacturer Alfa Romeo from 1951 to 1954.  Developed on request of the Italian Ministry of Defence, it was made in both military (AR 51) and civilian (AR 52) versions. Covini Engineering is an Italian car manufacturer that was formed in 1978 by Ferruccio Covini.  The company is generally best known for the Covini C6W, a 6-wheeled sports car that has two axles (four wheels) in the front of the car. Alfa Romeo Automobiles S.p.A. (] ) is an Italian car manufacturer, founded as A.L.F.A. ("Anonima Lombarda Fabbrica Automobili", "Anonymous Lombard Automobile Factory") on 24 June 1910, in Milan.  The brand is known for sporty vehicles and has been involved in car racing since 1911. The Lamborghini Countach is a rear mid-engined, V12 sports car produced by Italian car manufacturer Lamborghini from 1974 to 1990.  Its design pioneered and popularized the wedge-shaped, sharply angled look popular in many high-performance sports cars.  It also popularized the "cab forward" design concept, which pushes the passenger compartment forward to accommodate a larger rear-mounted engine. The Lancia Stratos HF  ("Tipo 829"), widely and more simply known as Lancia Stratos, is a sports car and rally car made by Italian car manufacturer Lancia.  The HF stands for "High Fidelity".  It was a very successful rally car, winning the World Rally Championship in 1974, 1975 and 1976.
Answer: the wedge-shaped