A tricycle, sometimes abbreviated to trike, is a human-powered three-wheeled vehicle.
Modern upright tricycle
Stephan Farffler's hand-controlled three-wheeled wheelchair
19th century tricycle used in Iran
Girl riding a delta tricycle in 1952.
A three-wheeler is a vehicle with three wheels. Some are motorized tricycles, which may be legally classed as motorcycles, while others are tricycles without a motor, some of which are human-powered vehicles and animal-powered vehicles.
Campagna T-Rex
1932 Morgan Aero 2-Seater Sports
Fuldamobil three-wheeler (Postwar-era Germany)
Tricycle truck in Poland (Gorzów Wlkp)