Glossary

Angle of Attack (AOA): The angle between the gun cross and the flight path marker.

Unloading: Simply you push your stick forward enough to put your gun cross on top of the flight path marker, thereby reducing your angle of attack to 0° (or close enough anyway). To maintain it there you will need to maintain a steady pitch over forward. (This will also cause you to hit 0G, hence the term Unloading).