A signal indicating zone time is preceded by which letter?

The letter T is used to indicate a signal for zone time in maritime communications. This is part of the International Association of Lighthouse Authorities' signaling system, which is designed to provide clarity and standardization for time-related information across different geographical zones. When you see a signal that features the letter T, it signifies that the communication pertains specifically to zone time, helping navigators stay aligned with the time standards they need to follow while at sea.

Understanding the purpose of these signals is crucial for safe navigation and effective communication at sea, ensuring that all vessels can coordinate their operations and planning according to universally recognized time designations. The other letters do not represent this specific function related to zone time, thereby reinforcing the distinct role of the letter T in maritime signaling protocols.