Agility
Agility is an upgradable statistic that differs for each ship. The agility affects the rate at which a ship can accelerate to max speed and the rate at which the ship can turn or change directions.
FuryStar: Highest acceleration and turning speed
Bastion: Lowest turning speed
Shadow X-3: Lowest acceleration
This is located at #8 of the upgrade GUI and can be upgraded by pressing 8.