The attitude of the vehicle with respect to the vehicle's central body inertial coordinate system, expressed using YPR angles. Additionally, provides information on the attitude segment being used at the given time. YPR angles specify attitude using three rotations in sequence: a rotation about the X axis is called roll (R), a rotation about the Y axis is called pitch (P), and a rotation about the Z axis is called yaw (Y). Unlike Euler angles, the rotations are not made about axes defined by an earlier rotation: each rotation is made about the reference system's axes.