Signals that can travel in only one direction on a medium are referred to as what type of signal?

Simplex

Explanation:

Simplex is an example of a communication channel in telecoms that transmits signals in one direction. The signal that sends and the one that receives are usually on the same frequency. When you listen to your favorite radio station, signals from the radio station get to you, but at no one point will you ever send the signals back. The sender of the message (radio station), can only forward, and you on the hand (audience), will only receive. This is the best example of information transmitted in one direction