Which word is used to indicate that a response is not required at the end of a radio transmission?

The term used at the end of a radio transmission to indicate that a response is not required is "Out." This word signifies that the communication has concluded, and the sender does not expect the recipient to reply. In radio communication protocols, clarity and brevity are essential, and "Out" effectively conveys that the sender is finished with their message and is not waiting for any further dialogue.

This term contrasts with other phrases like "Over," which indicates that the sender has completed their transmission but is still expecting a reply, as well as "Clear" and "Done," which do not carry the same standard connotations in radio communication protocols. The specific usage of "Out" helps maintain efficient communication by clearly signaling the end of the interaction.