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Early in the 20th century, the ratio was used to specify the world format starting with 1 cm (0.39 in) as the short edge of the smallest size. Walter Porstmann started with the largest sizes instead, assigning one an area of 1 m 2 (11 sq ft) (A0) and the other a short edge of 1 m (3 ft 3 in) (B0). He thereby turned the forgotten French sizes ...
A0 is defined so that it has an area of 1 m 2 (11 sq ft) before rounding to the nearest 1 millimetre (0.039 in). Successive paper sizes in the series (A1, A2, A3, etc.) are defined by halving the area of the preceding paper size and rounding down, so that the long side of A( n + 1) is the same length as the short side of A n .
This allows bleed (ink to the edge) on printed material that will be later cut down to size. These paper sheets will after printing and binding be cut to match the A format. The ISO A0 format has an area of 1.00 m 2; The ISO RA0 format has an area of 1.05 m 2; The ISO SRA0 format has an area of 1.15 m 2
A0, A-0, A 0, or a 0 may refer to: 101 A0 and 103 A0, two versions of the German Heinkel Tourist moped; A0 paper size, an international ISO 216 standard paper size (841 × 1189 mm), which results in an area very close to 1 m 2; A0 highway (Zimbabwe), a highway which orbits Zimbabwe; A0, the lowest A (musical note) note on a standard piano; A0 ...
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Smaller formats include the duodecimo (12mo or twelvemo), with twelve leaves per sheet and pages one-third the size of the quarto format, and the sextodecimo (16mo or sixteenmo), with sixteen leaves per sheet, half the size of the octavo format and one quarter the size of the quarto. The vast majority of books were printed in the folio, quarto ...
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In the US, size names are often denoted with a code of the format nR, where the number n represents the length of the shorter edge in inches. In the normal series, the long edge is the length of the short edge plus 2 inches (10 in or less) or 3 inches (11 in and above).