What designation is used for restricted areas on aeronautical charts?

The designation used for restricted areas on aeronautical charts is indicated by the letter "R" followed by a number. Restricted areas are established to contain hazardous activities that may impose a potential hazard to aircraft flying in the vicinity. The "R" designation helps pilots easily identify these restricted airspaces, as they need to exercise caution and may require permission from the controlling agency to enter. This system of designating airspace allows for better situational awareness and safety in aviation operations.

In contrast to restricted areas, other categories such as "P" refer to prohibited areas, "M" is associated with military operations areas, and "D" designates warning areas, each having their own specific regulations and purposes. Understanding these distinctions is crucial for pilots to ensure safe flight operations.