Kidding right? It is the key that you hit when you get to the end of a line. The key you had to use on a type writer. It is the key labeled "enter" today. On the first keyboards I remember it was called return. It is how you start a new line if you do not use word wrap. Carriage return is how it was taught to me back in the 70's. I need to go find a picture of the first computer I ever programmed on.