information card
A piece of paper for writing information.
In Japan, it often refers to the Kyoto University style card introduced by Tadao Umesao in The Art of Intellectual Production in 1969.
Tadao Umesao calls it Kyoto Oversize Card.
Kyo large cards are B6 size (182mm x 128mm)
Small cards are just a "memo" and can't be used in place of a full-fledged notebook.
Technology of Intellectual Production p. 50
In other words, it's implicitly supposed to be used as a replacement for a full-fledged notebook.
I assume you mean "a means of stocking information."
This was in 1969; now in 2018, it's "information stock should be electronic and searchable."
Related: Scrapbox is a notebook.
https://gyazo.com/cce145cffaef02e3354d870c339b29ea
The Art of Intellectual Production, p.56 # Granularity of information
In addition to these information cards, Umesao uses a B8 size paper called "small stature". This one is not stocked, but used and discarded.
When the work is done, the kozane is no longer needed. Just roll it up and throw it away. (p.205)
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