What symbol indicates a MOCA on a chart?

The symbol that indicates a Minimum Obstacle Clearance Altitude (MOCA) on an aviation chart is represented by an asterisk. The asterisk is used to denote specific altitudes that ensure aircraft can maintain safe vertical clearance from obstacles in the vicinity of the route. In this case, MOCA not only provides safe vertical clearance but also ensures adequate navigational signal coverage. Therefore, recognizing this symbol is crucial for pilots and air traffic controllers when assessing obstacle clearance requirements along a flight route. The other symbols listed do not have any established meanings related to MOCA on aviation charts.