The EFW N-20 Aiguillon () was Switzerland's first indigenous jet fighter aircraft. The Swiss Federal Aircraft Factory developed a design for a four-engined swept winged fighter following the end of the Second World War. During the test programme an unpowered glider was built and flown. A turbojet powered test aircraft, known as the Arbalète () also flew. The N-20 design was not produced, both the single Aiguillon and Arbalète airframes survive and are on public display at the Flieger-Flab-Museum, Dübendorf, the glider test aircraft was destroyed in an accident.