Application
Before the adoption of ISO 216, many different paper formats were used internationally. These formats did not fit into a coherent system and were defined in terms of non-metric units.
The ISO 216 formats are organized around the ratio ; two sheets next to each other together have the same ratio, sideways. In scaled photocopying, for example, two A4 sheets reduced to A5 size fit exactly onto one A4 sheet, and an A4 sheet in magnified size onto an A3 sheet, in each case there is neither waste nor want.
The principal countries not generally using the ISO paper sizes are the United States, Canada and Venezuela, which use the Letter, Legal and Executive system. Although they have also officially adopted the ISO 216 paper format, Colombia, Mexico, The Philippines and Chile also use mostly U.S. paper sizes in ordinary usage.
Rectangular sheets of paper with the ratio are popular in paper folding, where they are sometimes called "A4 rectangles" or "silver rectangles". However, in other contexts, the term "silver rectangle" can also refer to a rectangle in the proportion, known as the silver ratio.
Read more about this topic: ISO 216
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—Lewis Carroll [Charles Lutwidge Dodgson] (1832–1898)