An index card is a piece of heavy paper stock, cut to a standard size and often used for recording individual items of information that can then be easily rearranged and filed. The most common size in the United States and Russia is 3 inch by 5 inch (76 by 127 mm), hence the synonym 3 by 5 card. Other sizes widely available include 4 in by 6 in (102 by 152 mm), 5 in by 8 in (127 by 203 mm) and ISO-size A7 (74 mm by 105 mm). Cards are available ruled or blank, white or colored. Stationers sell special divider cards with protruding tabs and a variety of cases and trays to hold the cards. Piece of paper Paper is a thin, flat material produced by the compression of fibres. ... Mid-19th century tool for converting between different standards of the inch An inch is an Imperial unit of length. ... MM or Mm or mm can stand for: Roman numeral for 2,000 and the year 2000 A millimetre (mm) or megametre (Mm) Myanmar Master of Management Maelzels metronome: precedes a beats-per-minute tempo measurement Maximum Medicine My Medicine Modern Medicine Monster Manual – one of the three Core... In other languages Iso means the following in other languages: Big in Finnish a Latin transliteration of the Greek ίσος, meaning equal. ...

As the name implies, index cards were widely used in the nineteenth and twentieth centuries to create an index to large collections of documents. A major law firm, for example, might have a room full of metal cabinets with drawers designed to hold index cards. Clerks might fill out several cards for an individual document or legal case, allowing them to be filed alphabetically under a number of terms. Alternative meaning: Nineteenth Century (periodical) (18th century — 19th century — 20th century — more centuries) As a means of recording the passage of time, the 19th century was that century which lasted from 1801-1900 in the sense of the Gregorian calendar. ... (19th century - 20th century - 21st century - more centuries) Decades: 1900s 1910s 1920s 1930s 1940s 1950s 1960s 1970s 1980s 1990s The 20th century lasted from 1901 to 2000 in the Gregorian calendar (often from (1900 to 1999 in common usage). ... Look up Index in Wiktionary, the free dictionary Index can be defined as: Index in the sense of an ordered list has the plural form indexes. ... A law firm is a business entity formed by one or more lawyers to engage in the practice of law. ...

Later 20th century innovations based on the index card are the needle card, which was an index card with prepunched holes near the edges. Users of these systems assigned a category to each hole position, and then notched out the hole when a card fit a category. A needle or rod was then used to locate all cards that matched the category.

Computing and pre-computing technology turned this into the Hollerith card, where all the data was punched onto the card with punchcard machines and the sorting (and later data input to the computer) done automatically. The punch card (or Hollerith card) is a recording medium for holding information for use by automated data processing machines. ...

While computers have largely supplanted index cards in this role, the cards are still a popular way of organizing ideas, quotes, and references while researching and writing books, articles, and term papers. The tower of a personal computer (specifically a Power Mac G5). ... A book is a collection of leaves of paper, parchment or other material, bound together along one edge within covers. ...