How are prohibited areas indicated on aeronautical charts?

Prohibited areas are indicated on aeronautical charts by being marked with a "P" followed by a number. This designation serves to inform pilots about regions where flight is not allowed, ensuring that they can avoid these areas for safety and regulatory compliance. Prohibited areas are established for reasons such as national security, and clear identification is crucial for maintaining separation from such zones during flight operations.

The choice that indicates prohibited areas in a different way, such as by coloring or using other symbols, does not reflect the standard practices for denoting these areas on aeronautical charts. Understanding the correct labeling helps pilots navigate the airspace safely and comply with air traffic regulations.