What is the designation for prohibited areas in airspace charts?

The designation for prohibited areas in airspace charts is indicated by a "P" followed by a number. This system helps pilots recognize areas where air traffic is completely restricted and entry is not allowed. Prohibited areas are established for security or safety reasons, such as military operations or sensitive installations.

Understanding this system is crucial for pilots and unmanned aircraft operators to ensure compliance with airspace regulations, as entering a prohibited area can lead to severe consequences. The use of a "P" designation effectively communicates this critical information at a glance on navigation charts, thereby enhancing situational awareness and safety in the airspace system.