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The area of B series sheets is in fact the geometric mean of successive A series sheets. B1 is between A0 and A1 in size, with an area of 0. While less common in office use, the B series is used for a variety of special applications. B5 is a relatively common choice for books. B4, B5 and B6 are used for envelopes that fit C-series envelopes. The B-series is widely used in the printing industry to describe both paper sizes and printing press sizes, including digital presses. B3 paper is used to print two US letter or A4 pages side by side using imposition ; four pages would be printed on B2, eight on B1, etc.
The C series is defined in ISO , which was withdrawn in without a replacement, but is still specified in several national standards. It is primarily used for envelopes. The area of C series sheets is the geometric mean of the areas of the A and B series sheets of the same number; for instance, the area of a C4 sheet is the geometric mean of the areas of an A4 sheet and a B4 sheet.
This means that C4 is slightly larger than A4, and slightly smaller than B4. The practical usage of this is that a letter written on A4 paper fits inside a C4 envelope, and both A4 and C4 paper fits inside a B4 envelope.
Some envelope formats with mixed sides from adjacent sizes and thus an approximate aspect ratio of are also defined in national adaptations of the ISO standard, e.
Hook with nut, DIN 15401 - grade P