from the Pugachev Cobra wiki:
"The maneuver consists of the pilot pulling the aircraft to a 90°–120° angle of attack, then back down to zero. In a properly performed Pugachev's Cobra, the plane maintains a straight and level flight throughout the maneuver.

The vertical form of this maneuver is called a Cobra, named after the snake that behaves in a similar manner. Performing the maneuver on the horizontal plane results in the aircraft effectively stopping while the enemy overshoots, leaving the aircraft in a position for a straightforward missile attack on the enemy aircraft."