The Peace Symbol was originally designed in 1958 for the British nuclear disarmament movement by Gerald Holtom and is based on the semaphore signals for "N" and "D."
WNYC Covers the Great Anti-Nuclear March and Rally at Central Park, June 12, 1982
Hundreds of thousands of peaceful demonstrators opposed to nuclear arms overwhelmed Central Park and midtown Manhattan on June 22, 1982, filling the streets and groves with echoing songs and hopeful slogans.
The "Doomsday Clock" was created in 1947 by the Union of Concerned Scientists in response to nuclear threats. The clock symbolizes a hypothetical global catastrophe as midnight.