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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.Other sizes widely available include 4 by 6 inches (101.6 by 152.4 mm), 5 by 8 inches (127.0 by 203.2 mm) and ISO-size A7 (74 by 105 mm or 2.9 by 4.1 in).
Paper size standards govern the size of sheets of paper used as writing paper, ... US index cards inch × inch mm × mm AR 3 × 5 76.2 × 127: 5∶3: 4 × 6 102 × 152:
It also suggested that a larger card, approximately 3 by 5 inches (8 cm × 13 cm), would be preferable. By the end of the nineteenth century, the bigger card won out, mainly to the fact that the 3-by-5-inch (8 cm × 13 cm) card was already the "postal size" used for postcards.
Reference notes. A reference card or reference sheet (or quick reference card) or crib sheet is a concise bundling of condensed notes about a specific topic, such as mathematical formulas [1] to calculate area/volume, or common syntactic rules and idioms of a particular computer platform, application program, or formal language.
An "informative" (i.e. non-mandatory) annex [7] describes how an ID-000 sized card may be included in an ID-1 size card for processing (e.g. in an ID-1 reader), but with "relief areas around the perimeter of the ID-000 size card to allow it to be removed from the ID-1 size card without punching tools". An ID-1 size card containing an ID-000 ...
The cards used vary widely in size, from the original 1 + 1 ⁄ 2-by-3 + 1 ⁄ 2-inch (3.8 cm × 8.9 cm) Vis-Ed brand flash cards, to half or full index cards, to simply sheets of A7 sized paper. Cards may be created with any marking medium and need not conform to any conventions of size or content unless specified within the scope of the game.