What is the internationally recognized Urgency signal?

The internationally recognized Urgency signal is indeed indicated by the words "PAN PAN" spoken three times before the Urgency call. This signal is used in maritime and aeronautical communication to alert others that there is a condition concerning the safety of a vessel, an aircraft, or people. The repetition of "PAN PAN" serves to emphasize the urgency of the situation, clearly communicating that assistance may be needed but that it is not a life-threatening emergency, which is signified by the term "Mayday."

This distinguishes it from other signals; for example, "TTT" transmitted three times by radiotelegraphy is actually associated with distress signals, not urgency. Similarly, the three oral repetitions of the word "Safety" are not a recognized international signal for urgency but relate to safety messages. "Mayday" is reserved for emergencies that require immediate assistance and indicates a more critical situation than what "PAN PAN" conveys. Thus, the correct identification of "PAN PAN" underscores its specific purpose in urgent communication.