The abbreviation for a distress signal is DS or SOS.
Emergency distress signal
no
S.o.s
i
Distress.
Flying a flag upside down is a signal of distress or danger. It is used as a universal sign of an emergency to seek help or attention.
acute respiratory distress syndrome
Assist as best as you can or go to shore and put a distress signal
sos
Save our ship
SOS
SOS means Save Our Ship, which is a distress signal used obviously by ships in distress at the ocean.