The Crossword Solver found answer to “Decisive periods, in brief”, 3 letters crossword clue. The Crossword Solver finds answers to American-style crosswords, British-style crosswords, general knowledge crosswords and cryptic crossword puzzles.
Answer : SOS
In Morse code, SOS is made up of three dots, three dashes, and three more dots: …—…
Because it’s made up of three letters, it’s natural to assume SOS is an acronym. However, it was never meant to stand for anything. The Marconi Yearbook of Wireless Telegraphy and Telephony, published in 1918, gives an explanation of the meaning, or lack of meaning, behind the letter choices:
Simply, SOS was chosen as a distress signal because it was easy to understand in Morse code and not likely to be confused with other signals. It also has the added benefit of being a palindrome, a series of letters that reads the same backwards and forwards.
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