Standard sizes of paper / From Wikipedia, the free encyclopedia
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Paper size standards govern the size of sheets of paper used as writing paper, stationery, cards, and for some printed documents.
Standard sizes of paper
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.