The peace symbol made its debut on Easter weekend, 1958, in the UK.
From
Peace Symbol History:
One of the most widely known symbols in the world, in Britain it is recognised as standing for nuclear disarmament – and in particular as the logo of the Campaign for Nuclear Disarmament (CND). In the United States and much of the rest of the world it is known more broadly as the peace symbol. It was designed in 1958 by Gerald Holtom, a professional designer and artist and a graduate of the Royal College of Arts. He showed his preliminary sketches to a small group of people in the Peace News office in North London and to the Direct Action Committee Against Nuclear War, one of several smaller organisations that came together to set up CND.
The symbol itself is built on the semaphore code letters "N" and "D", which stand for nuclear disarmament. The circle represents the whole world, and as a whole the symbol means global nuclear disarmament.
Since its creation in 1958, it has been adopted by people around the world who fight for peace and justice, and remains a powerful symbol to this day.