An Angle of Attack (AOA) indicator is a flight instrument that shows a pilot the angle between the aircraft's wing and the oncoming air, providing a crucial safety margin by warning of an approaching aerodynamic stall. Unlike airspeed.
A Vertical Speed Indicator (VSI), also known as a Rate of Climb and Descent Indicator (RCDI) is an instrument which indicates the rate of climb or descent of an aircraft.
These devices are installed and compatible with F-16 series aircraft and KAI's T-50/FA-50 series aircraft.