See first sentence of entry for tandem and cut in half. A bike for minimalists. Favoured by circus personnel. Users often fall prey to a Napoleon complex, opting for taller and taller models as the disease progresses.

A one-wheel cycle having pedals attached to the axle and a saddle attached to the upper end of the fork tubes.

a vehicle with a single wheel that is driven by pedals

a one wheeled device, somewhat difficult to balance

a single-wheeled vehicle traditionally used during circus performances

a single-wheel vehicle

a vehicle with one wheel that is moved by pedals

cycle of the one-wheel, with cyclist on the wheel.

A circus apparatus, a one-wheel bicycle with a small seat or without seat.

A one wheeled bike with no handle bars.

A unicycle is a one-wheeled human powered vehicle. Unicycles are similar to, but less complex than, bicycles.

The term unicycle is often used in robotics and control theory to mean a generalised cart or car moving in a two-dimensional world; these are also often called "unicycle-like" or "unicycle-type" vehicles. This usage is distinct from the literal sense of "one wheeled robot bicycle".