🔍 Key Concepts

• International Code of Signals (INTERCO) procedures for radiotelephone • Standard prowords used to mark the end of a transmission • Difference between general calling signals (like calling all stations) and end‑of‑message signals

💭 Think About

• Which of these groups is commonly associated with calling all stations, rather than ending a message? • In radio practice, what short procedural word or group is traditionally used to mean "end of transmission, no reply expected"? • Think about which of these signal groups appears on standard radiotelephone/ICS procedure cards as an end of message indicator.

✅ Before You Answer

• Verify which group is defined in the International Code of Signals specifically as "end of transmission" or "end of message". • Check which option is widely used as a general call to all stations in radio communications and eliminate that one. • Confirm that the correct group is a procedural signal, not a regular two‑letter code for a phrase or distress/safety meaning.