Often just called collimated light due to the collimator being the main procedure to obtain it.
However, you move very far away from the source, e.g. the Sun, you also get essentially parallel light.
Articles by others on the same topic
A collimator turns light from a source near its focus into a nearly parallel beam. A slit of width produces an angular width approximately , where is the focal length.
A collimator is an optical device used to narrow a beam of particles or waves. It ensures that the rays emitted from a source are parallel or nearly parallel, which helps improve the precision and focus of the beam in various applications.