An imaginary line running through an aircraft from left to right through its center of gravity.

The axis extending through the center of gravity of an aircraft, and parallel to a line connecting the tips of the wings. The lateral axis is sometimes called the "y" axis. Pitch is a motion around the lateral axis.

An imaginary line passing through the centre of gravity and parallel to a line joining the wing tips. Movement about the lateral axis is termed "pitching."

The axis extending through the centre of gravity of an aircraft and parallel to the wing surfaces.

The axis that runs through the hips, somersaults run through this axis.

Axis roughly defined as through the hips, around which front and back somersaults are done.

Axis going from side-side around which somersaults are done