Final answer:
The rotational symmetry with only one axis of rotation is known as radial symmetry, which is where multiple planes of symmetry intersect at the center.
Step-by-step explanation:
The name given to the rotational symmetry of a figure if the figure has only one axis of rotation is radial symmetry. This kind of symmetry can be observed when there are multiple planes of symmetry that all intersect at an axis through the center of the figure or organism. In nature, this is seen in the radial symmetry of a coral polyp, where it can be divided into identical pie-like sections, but not into right and left halves. Similarly, in arts and optical devices, radial symmetry or an optical axis creates a sense of unity or directs light in a specific manner.