The Universal Symbol of Peace

The Universal Symbol of Peace, ca. 1958
Designed by Gerald Holtom, British

Mr. Holtam a long time peace activist designed the symbol based on
letters from the flag-signalling alphabet, N for nuclear and D for
disarmament, then placing them within a circle symbolising Earth.
Although the symbol started out as “no more nukes”. It has become the
universal symbol for peace.