In fact, the signals indicating "emergency help" in radio communication are three short, three long and three short. Because three short symbols in Morse code stand for S and three long symbols stand for O, the emergency distress signal is called SOS for short. Because this signal is simple and clear, it is adopted by all countries in the world. Now, whether it is a ship or an airplane, you can use SOS for help when you are in danger. After receiving this signal, anyone and any country have the obligation to go to the rescue, which has become an international practice, but generally the letters SOS should be capitalized.

Save our souls (save us);

SOS is an international emergency distress signal.

In fact, the signals indicating "emergency help" in radio communication are three short, three long and three short. Because three short symbols in Morse code stand for S and three long symbols stand for O, the emergency distress signal is called SOS for short. Because this signal is simple and clear, it is adopted by all countries in the world. Now, whether it is a ship or an airplane, you can use SOS for help when you are in danger. After receiving this signal, anyone and any country have the obligation to go to the rescue, which has become an international practice, but generally the letters SOS should be capitalized.