Index card

An index card (or record card in British English and system cards in Australian English) consists of card stock (heavy paper) cut to a standard size, used for recording and storing small amounts of discrete data. A collection of such cards either serves as, or aids the creation of, an index for expedited lookup of information (such as a library catalog or a back-of-the-book index). This system is said to have been invented by Carl Linnaeus, around 1760.

For the book, see The Index Card.
"Card index" redirects here. For the rotating device used to store information, see Rolodex. For the note system used by writers, see Card file.
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