SOS still has to look like SOS when cut in a snowbank or written in stone on a beach regardless of how far the helicopter approaches. Not only is SOS a palindrome word it is also an ambigram, a comment that is identical when read upside down or right-side up. ” The sequence of triplet dots and dashes soon became a worldwide favorite due to graceful simplicity. Transposed into morse-code SOS looks like this,” three dots, three dashing, three dots. SOS was introduced in a 1905 set of radio rules to differentiate from less significant telegraph transmissions. Why was SOS chosen as a distress signal?.
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