Mayday: Used for declaring emergencies, the term is said three times. 'Mayday Mayday Mayday' signifies 'grave and imminent danger,' and comes from the French M'aidez meaning 'help me.' Mayday is the voice term, SOS in used in writing or Morse.
Roger: Etymology: from Roger, former communications code word for the letter r-- used especially in radio and signaling to indicate that a message has been received and understood
We have designed our civilization based on science and technology and at the same time arranged things so that almost no one understands anything at all about science and technology. This is a clear prescription for disaster.