Model shows rays of sunlight, moving straight from the sun perpendicular to the surface of the Earth. What are these rays called?

These rays are called vertical or direct rays.

The rays of sunlight that move straight from the sun and are perpendicular to the surface of the Earth are called "solar rays" or "sunbeams."

These rays of sunlight, moving straight from the sun perpendicular to the surface of the Earth, are called "incident rays" or "incoming rays".