Wikipedia
A velomobile, or bicycle car, is a human-powered vehicle (HPV) enclosed for aerodynamic advantage and protection from weather and collisions. They are derived from recumbent bicycles and tricycles, with the addition of a full fairing (aerodynamic shell).
Pedal powered faired vehicles intended primarily for racing are usually called streamliners. Streamliners have set many speed and distance records.
There are few velomobile manufacturers; some are home-built. Some models have the operator's head exposed; this has the advantage of giving the operator unobstructed vision, hearing, and some cooling, with the disadvantage of being more exposed to weather and less aerodynamic.
Hybrid vehicles exist which can use both human power and assistance by an electric motor. Small three- and four-wheeled motor vehicles are called microcars.