Tocsin

A Tocsin is an alarm or other signal sounded by a bell or bells. It may refer to:

==Cold War== TOCSIN, the codeword attached by the Royal Observer Corps to any reading on the Bomb Power Indicator after a nuclear strike on the United Kingdom during the Cold War Tocsin Bang, the codeword attached by the Royal Observer Corps to any reading on the AWDREY instrument after a nuclear strike on the United Kingdom during the Cold War Exercise Tocsin, a name for the nuclear attack simulation performed by the Government of Canada Tocsin, a Harvard undergraduate group against nuclear weapons and by 1963 also against the Vietnam War, led by Todd Gitlin