A common symbol of peace is the dove, often depicted with an olive branch in its beak. This imagery dates back to ancient history, particularly the Biblical account of Noah's Ark, where a dove brought back an olive branch to signify the receding of the flood. Over the years, the dove has become universally recognized as a representation of tranquility, harmony, and non-violence. Additionally, the peace symbol, which combines elements of a crow's foot and the semaphore signals for the letters "N" and "D" (nuclear disarmament), also serves as a modern emblem of peace movements worldwide.