CQ-R is a term used in the radio communications industry to signify the transmission of a message or to ask if anyone is listening. It is important in emergency situations, or when trying to establish contact with others. There are several synonyms for CQ-R, depending on the context and the intended message. Some common synonyms include Mayday, SOS, Alert, Attention, and Emergency. These terms all convey a sense of urgency and importance, letting others know that the speaker requires assistance or communication. Additionally, terms like Hello, Anyone There, or Over can also be used to start a conversation or establish contact with someone over the radio.