Index cards are used for a wide range of applications and environments: in the home to record and store recipes, shopping lists, contact information and other organizational data in business to record presentation notes, project research and notes, and contact information in schools as flash cards or other visual aids and in academic research to hold data such as bibliographical citations or notes in a card file. They are part of standard stationery and office supplies all around the globe. Special divider cards with protruding tabs and a variety of cases and trays to hold the cards are also sold by stationers and office product companies. Cards are available in blank, ruled and grid styles in a variety of colors. The most common size for index card in North America and the UK is 3 by 5 inches (76.2 by 127.0 mm), hence the common name 3-by-5 card. This system is said to have been invented by Carl Linnaeus, around 1760. 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). 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.
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