Crossword Genius

Message communicated as "short-short-short, long-long-long, short-short-short" (3)

Ross

I believe the answer is:

sos

(Other definitions for sos that I've seen before include "Morse Code for help" , "Coded distress signal" , "Emergency message" , "Appeal for help" , "Call for help" .)

I've seen this clue in The New York Times.
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