Aeronautical Information Publication

Aeronautical Information Publication (or AIP) is defined by ICAO as a publication issued by or with the authority of a state and containing aeronautical information of a lasting character essential to air navigation. It is designed to be a manual containing thorough details of regulations, procedures and other information pertinent to flying aircraft in the particular country to which it relates. It is usually issued by or on behalf of the respective civil aviation administration.
See more at Wikipedia.org...