The Academy Duel Disk also seems to take elements from the DiaDhank, as its shape when in standby mode looks like the blades on the DiaDhank.

Rather, the priests used the power of their Millennium Items to summon the creatures from the stone tablets. Shimon Muran describes a DiaDhank as a device use for calling for Duel Monster Spirits that are sealed away in Stone Tablets. The design of the second Duel Disk suggests that Seto Kaiba designed it based on memories from his past life as Priest Seto, who used the Millennium Rod. Also, in the vision that Kaiba and Yami Yugi saw in episode 132, both Priest Seto and Pharaoh Atem used their Millennium Items. Rather, he used his Millennium Puzzle to summon Obelisk. In the vision that Yami Yugi saw in his Duel with Dartz he did not use his DiaDhank to summon Obelisk the Tormentor. Notice that DiaDhanks were seen in the final season of Yu-Gi-Oh!, and, in Yu-Gi-Oh! GX, Abidos the Third (the fifth Shadow Rider) used a DiaDhank in flashbacks Dueling his servants in episode 40. It is heavily implied only Millennium Item bearers can use a DiaDhank without being limited by life energy.

Since summoning monsters drains life force, the losing Duelist faints or dies. In place of the Life Point counter is the Eye of Wdjat, which contains a glowing yellow meter that measures the user's Ba, as the disk measures life points. Unlike the Duel Disk, the DiaDhank can only control up to 3 monsters at once. The Duel Disk is based on an ancient Egyptian artifact called a 'DiaDhank', a golden device worn much like a Duel Disk that uses the user's Ba (spirit energy) to summon Ka (spirit monsters) from their stone tablets and control them. Sacred Guardians readying their DiaDhanks.

3 Yu-Gi-Oh! The Dark Side of Dimensions.

Crystal disk mark explained