Standards and Recommended Practices

Standards And Recommended Practices (SARPs) are technical specifications adopted by the Council of the International Civil Aviation Organization (ICAO) in accordance with Article 37 of the Convention on International Civil Aviation in order to achieve "the highest practicable degree of uniformity in regulations, standards, procedures and organization in relation to aircraft, personnel, airways and auxiliary services in all matters in which such uniformity will facilitate and improve air navigation". SARPs are published by the ICAO in the form of Annexes to Chicago Convention.

Source: Wikipedia — Standards and Recommended Practices (CC BY-SA 4.0)