The Amduat is also known as the Book of the Hidden Chamber.
The title reflects the composition’s focus on the hidden underworld region through which the sun god travels after setting. The text describes divine encounters and transformations during the twelve hours of night, ending with the sun’s emergence at dawn.
Its scenes were painted in royal tombs, where the nocturnal solar journey had direct meaning for the deceased king. By joining the sun’s cycle, the king could participate in renewal rather than simply face a static realm of death.
“Book of the Hidden Chamber” is a translation of a title associated with the work, while “Amduat” is the commonly used modern name. It should not be treated as another name for every Egyptian underworld book.