It is the Hereafter;
The name probably comes from the root dua: “morning”, used to indicate what precedes the morning, that is, the night, and particularly the land of the night, the hereafter.
Pictorially, it is pictured as a star inscribed in a circle.
This proves the doctrine of a celestial (stellar) hereafter preceding the doctrine of Osiris (earthly).
The pictures of this divinity are extremely rare.
One of them can be seen on Sethi I ’s sarcophagus, in an image dedicated to the final part of the ritual “The book of the doors”