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In Toaru Majutsu no Index, the card's material was changed from vinyl to ABS resin, which was instituted by the United States of America in 1992 due to a trick that the fingerprints on the card made it possible to determine the card's contents.
There are five different Zener cards: a hollow circle (one curve), a Greek cross (two lines), three vertical wavy lines (or "waves"), a hollow square (four lines), and a hollow five-pointed star. There are 25 cards in a pack, five of each design.
The esper being tested must be able to determine what the contents of the card is correctly.
Toaru Majutsu no IndexEdit
- Main article: Sisters Arc
Three Stories ArcEdit
- Main article: Three Stories Arc
In the anime adaptation, cards are shown on Touma's coffee table during his attempt at finishing his summer homework.
Toaru Kagaku no RailgunEdit
Level Upper ArcEdit
- Main article: Level Upper Arc