救きゅう難なん信しん号ごう

noun

distress signal; SOS

Refers to any signal requesting help in an emergency, such as SOS, Mayday, flares, or radio calls.

• 船ふねが救きゅう難なん信しん号ごうを発はっ信しんした。

  The ship sent out a distress signal.

• 遭そう難なん者しゃは救きゅう難なん信しん号ごうを送おくり