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Wireless telegraphy was put into use on ships at the start of the 20th century, and sea traffic was growing. It quickly became evident that a global distress signal was required to aid with ship rescue. The SOS signal was chosen because it was simple to memorize and comprehend inside the Morse code. After all, it was already widely used. The "S," "O," and final "S" are simply represented by three dots, three dashes, and three more dots, respectively.