Nine-symbol message (3)
I believe the answer is:
sos
(Other definitions for sos that I've seen before include "Mayday call" , "International distress code" , "urgent appeal" , "Call for help" , "Help code in 13 Across" .)
I believe the answer is:
sos
(Other definitions for sos that I've seen before include "Mayday call" , "International distress code" , "urgent appeal" , "Call for help" , "Help code in 13 Across" .)