Flag semaphore tends to conjure images of modern-day military messaging — Navy personnel, for instance, waving bright squares of signal fabric on ships at sea. Historically, semaphore gained particular wartime prominence during the French Revolution, when it facilitated fast official communication across the nation. But semaphore has also become embedded in an iconic anti-war symbol,[…]

Source: Anti-War Semaphore: Hidden Meaning Encoded in a Universal Symbol of Peace – 99% Invisible