Crossword Genius

Ship's distress signal (3)

Ross

I believe the answer is:

sos

(Other definitions for sos that I've seen before include "Morse Code for help" , "Mayday call" , "Appeal for help" , "Emergency message" , "Distress call" .)

I've seen this clue in the Newsday, the Family Time and the Newsday.com.
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