A bit back, in one of those conversations that wanders around, and in an effort to show my great intelligence, I asked a buddy of mine how old the Peace Sign was. He thought really old. I knew it was actually from the 1960's and was related to the anti nuclear movement.
To show my actual stupidity, I couldn't remember the particulars. D'oh!
is derived from the semaphoric symbols for N and D
standing for Nuclear Disarmament.