(Especially in ancient Egypt) a winged disc representing a sun god.He worshiped Aten, the radiant god of the sun disk....
Well, Akenaton (or Akhenaten, or what have you) is usually given credit for introducing the concept, focusing worship on the sun disk Aton as the source of all life.
And it shows him worshipping the Aton, which is shown in the form of a sun disk.