Great Holocron
this was the largest and most comprehensive of the Jedi Holocrons, produced during the height of the Old Republic. It was a twelve-sided device that was designed for ease of use, and was called upon to provide young students of the Force with easy access to the ancient lore and training of the Jedi. It was believed that the scope and breadth of information contained in the Great Holocron had never been fully traversed, and even Master Yoda had never learned all its contents.