SOS is a Morse Code distress signal. Morse Code is a system that uses dots, dashes and spaces to communicate letters and numbers. It was first created during the 1830s by Samuel F.B. Morse but was ...

The distress signal CQD originated from the signal CQ, expressing "seeking you," or "all stations." The signal CQ was commonly used among wireless operators -- and land-based telegraphers before ...

Traditionally a distress signal, the inverted flag has been used as a form of protest in various contexts, from government policies to social issues. Recent displays this month—including the ...

In the 1920s, Frederick Stanley Mockford, an officer overseeing radio operations at Croydon Airport in England, faced a crucial task: developing a clear and concise distress signal for pilots.

By Michael Levenson It has been a widely recognized symbol of distress since the nation’s founding, when sailors turned the American flag upside down to signal that their ships were sinking ...