Long long long long ago did they use ... --- ... and that means save our souls?

Answer:
No, that was not the original meaning of the code S.O.S. The code does not stand for anything except that the sender needs help immediately. These particular letters were chosen for being easy to send and easy to understand when received. The 'save our souls' meaning was given for it much later in time.
First answer by Notyouraveragedummy. Last edit by Notyouraveragedummy. Contributor trust: 391 [recommend contributor recommended]. Question popularity: 1 [recommend question].