Some of these could emit a gamma-ray burst that funnels radiation very narrowly along the star’s rotational axis.

When an off-kilter magnetic field swings around the rotational axis, it creates periodic radio signals that can be used to calculate its rotation.

Archer notes that an explosion triggered on the surface of the comet by the away team has altered the comet's rotational axis.

This device uses a cylindrical rotor with longitudinal ducts parallel to its rotational axis.

These cams are principally used to convert rotational motion to linear motion parallel to the rotational axis of the cylinder.