Gimbal Lock
Gimbal lock is a phenomenon that occurs when the three gimbals of an attitude control system align in a single plane, causing a loss of one degree of freedom and making it impossible to control the orientation of the system in one direction. This occurs when the pitch angle approaches 90 degrees, causing the roll and yaw axes to become aligned. Gimbal lock can be avoided by using alternative attitude control systems, such as quaternions or Euler angles, or by using non-coplanar gimbals.
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