The iconic apple-shaped First Civilization artifact is called an Apple of Eden.
Apples of Eden are Pieces of Eden, advanced artifacts created by the First Civilization, also known as the Isu. They can influence human minds and produce other powerful effects, making them objects sought by both Assassins and Templars.
The series presents multiple Apples rather than one unique object. Their powers and appearances vary across historical periods, and different characters encounter different examples. The artifacts help connect the franchise's historical adventures to its science-fiction mythology.
The name can be confused with the general term “Piece of Eden,” which describes the wider category. An Apple of Eden is one particular type of Piece of Eden, while the category also includes objects such as the Staff and Sword of Eden. The apple shape became the best-known visual symbol of this mythology.