Aeronautical chart conventions (United States)
This article describes the graphic conventions used in Sectional charts and Terminal area charts published for aeronautical navigation under Visual Flight Rules in the United States of America. The charts are published "in accordance with Interagency Air Cartographic Committee specifications and agreements, approved by the Department of Defense and the Federal Aviation Administration".
Source: Wikipedia — Aeronautical chart conventions (United States) (CC BY-SA 4.0)