+A **rotational axis** is an imaginary line about which an object spins or revolves. It defines the [Plane](/wiki/plane) of [Rotation](/wiki/rotation), acting as its geometric center. This line can pass through the object itself or exist externally.
+## See also
+- [Spin](/wiki/spin)
+- [Orbit](/wiki/orbit)
+- [Torque](/wiki/torque)
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