What does "Over" indicate in radio communication?

In radio communication, the term "Over" is used to indicate that a transmission has been completed and the speaker expects a response from the recipient. This term is essential in maintaining clarity during conversations over radio, particularly in situations where multiple parties may be communicating at once or where interference might cause misunderstandings.

When a communicator says "Over," they are effectively signaling that it is the other party's turn to speak or respond. This helps to ensure that both parties are engaged in the conversation and that the flow of information is managed appropriately. Unlike the term "Out," which signifies the end of a conversation with no expectation of further dialogue, "Over" invites further communication.

Therefore, in the context of the options provided, understanding that "Over" denotes the completion of a transmission with an expectation for the recipient to reply is crucial for effective communication in radio operations.