Which term refers to the requirement for radio operators to listen before transmitting?

The term that refers to the practice of listening before transmitting is "Listen first." This concept is fundamental in radio communications to prevent interference and ensure effective communication. By listening before starting a transmission, operators can assess the channel for ongoing conversations or signals. This practice helps avoid overlap with other transmissions, which could lead to confusion or disruption of important communications. It also demonstrates courtesy among operators by allowing for more organized and efficient use of the communication frequency.

Understanding the importance of this practice is critical for maintaining orderly communication and adhering to radio operating protocols.