What is the name of the Assassin's Creed artifact often called the Apple of Eden?

The artifact often called the Apple of Eden is a Piece of Eden.

In Assassin's Creed lore, Pieces of Eden are advanced artifacts created by the Isu, an ancient civilization that existed before recorded human history. The Apples are spherical Pieces of Eden capable of influencing minds and producing other extraordinary effects, depending on the story and bearer.

Several Apples appear across the games, so “the Apple” does not always identify one unique object. Altaïr, Ezio, and other characters encounter Apples at different points in the series. The artifacts help explain why the Assassins and Templars repeatedly compete for ancient technology.

Players sometimes treat Apple of Eden as the formal name of every related artifact, but the broader category is Piece of Eden. Other Pieces include the Staff and the Shroud. Their fictional abilities are part of the series' science-fiction mythology, not claims about real historical objects.