KEEP CALM and CARRY ON

"Keep Calm and Carry On" was a poster produced by the British government in 1939 during the beginning of the Second World War, intended to raise the morale of the British public under the threat of impending invasion. It was little known and never used. Two-and-a-half million copies were printed, although the poster was distributed only in limited numbers. The designer of the poster is not known.

The poster was third in a series of three. The previous two posters from the series, "Your Courage, Your Cheerfulness, Your Resolution Will Bring Us Victory" (800,000 printed) and "Freedom is in Peril" (400,000 printed) were issued and used across the country for motivational purposes, as the Ministry of Information assumed that the events of the first weeks of the war would demoralise the population. Wikipedia