What does a chart symbol representing a "T" enclosed in a filled-in circle indicate?

The symbol representing a "T" enclosed in a filled-in circle indicates a Teleradar Weather Broadcast (TWEB). This type of chart symbol is specifically used to denote real-time weather information derived from radar data, allowing pilots and air traffic controllers to obtain a more accurate picture of ongoing weather conditions. TWEBs provide critical updates that can affect flight operations, making it essential for safe navigation and decision-making.

This symbol is part of the broader system of communications that informs pilots about weather phenomena, enhancing their situational awareness and safety in flight. While other options may pertain to various forms of weather or traffic advisories, they do not specifically relate to the radar-based information that TWEBs represent. Understanding the specific function of each symbol helps pilots and air traffic personnel use the chart effectively for flight planning and safety.