What is the name of the golden artifact central to many Assassin's Creed stories?

The golden artifact central to many Assassin's Creed stories is the Apple of Eden. It is one of the Pieces of Eden, powerful artifacts created by the Isu, an advanced civilization that existed before humanity's recorded history.

The Apple can influence perception and control minds, making it valuable to both the Templars and the Assassins. Its abilities vary across the series, but the object is repeatedly connected with domination, hidden history, and the struggle over human freedom.

The Apple is not the only Piece of Eden. Other artifacts include the Staff of Eden, the Sword of Eden, and the Shroud of Eden. The first game prominently features an Apple held by Robert de Sablé's faction, while later games reveal additional Apples and expand the Isu mythology. “Apple of Eden” identifies a type of artifact, not necessarily one single object throughout the franchise.