The Aton was the sun itself, recognised first in the Middle Kingdom, and later becoming an aspect of the sun god.
In the reign of Amenhotep IV during the 18th DynastyI, Aton was depicted as a disk with rays, each ray terminating in a human hand and bestowing symbols of “life” upon those below.
Aton was declared the only true deity during this period, becoming the first occassion of monethism in history, but the worship of Amon and the other deities were restored by Amenhotep IV’s successor Tutankhamon.