Ninja Info Cards
The cards. The info shown on the cards. 1 of 2
Name
Kanji	忍識札
Rōmaji	Ninshiki Kādo
Literal English	Ninja Info Cards
English TV	Ninja Info Cards
Debut
Manga	Chapter #39
Anime	Naruto Episode #23
Game	Naruto: Ultimate Ninja
OVA	Naruto: The Cross Roads
Appears in	Anime, Manga and Game
Data
Wielder Kabuto Yakushi Tsunade (Anime only)

Ninja Info Cards are a type of ninja tool where information can be burned on it by using chakra. The cards look blank to the naked eye with the kanji for 'shinobi' (忍) on the back, but when chakra is applied, various categories of data ranging from information about the Five Great Shinobi Countries to the ninja that inhabit them are displayed on the card, even in 3-D. However, only the person who originally burned the data onto the card is able to retrieve it.^[1]

References

1. ↑ Naruto Anime Profiles, Volume 1: Episodes 1-37, page 156