Why is a fourth plinth called a fourth plinth?

The term "fourth plinth" refers to a vacant pedestal in Trafalgar Square, London, which was originally intended for a statue but remained empty for many years. The name distinguishes it from the three other plinths that hold statues of historical figures. In 1999, the plinth was repurposed to showcase contemporary art installations, giving it a dynamic role in public art and cultural dialogue. Its designation as the "fourth plinth" reflects its unique status and evolving purpose within the square.