Dominions have the traditional angel form of a beautiful human figure with feathered wings. They have orbs of light on the pommels of their swords of the heads of their scepters.
From The Bible, English Standard Version edition:
For by him all things were created, in heaven and on earth, visible and invisible, whether thrones or dominions or rulers or authorities—all things were created through him and for him.
The book The Bible describes this angelic order.