Paper size standards govern the size of sheets of paper used as writing
paper, stationery, cards, and for some printed documents.
The ISO 216 standard, which includes the commonly used A4 size, is the
international standard for paper size. It is used across the world except in
North America and parts of Central and South America, where North American
paper sizes such as "Letter" and "Legal" are used. The international standard
for envelopes is the C series of ISO 269.
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