31 relations: ANSI/ASME Y14.1, Area, Aspect ratio, Brochure, Design rationale, Envelope, Floor and ceiling functions, Geometric mean, Geometric progression, Georg Christoph Lichtenberg, Gram, Grammage, Inch, International Organization for Standardization, ISO 128, ISO 217, Japanese Industrial Standards, Johann Beckmann, Letter (paper size), Mathematics of paper folding, Millimetre, Origami, Paper density, Paper size, Photocopier, Plus-minus sign, Rectangle, Silver ratio, Square metre, Square root of 2, University of Cambridge.

## ANSI/ASME Y14.1

In 1992, the American National Standards Institute adopted ANSI/ASME Y14.1 Decimal Inch Drawing Sheet Size and Format which defined a regular series of paper sizes based upon the de facto standard in × 11 in "letter" size which it assigned "ANSI A".

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## Area

Area is the quantity that expresses the extent of a two-dimensional figure or shape, or planar lamina, in the plane.

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## Aspect ratio

The aspect ratio of a geometric shape is the ratio of its sizes in different dimensions.

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## Brochure

A brochure is an informative paper document (often also used for advertising) that can be folded into a template, pamphlet or leaflet.

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## Design rationale

A design rationale is an explicit documentation of the reasons behind decisions made when designing a system or artifact.

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## Envelope

An envelope is a common packaging item, usually made of thin flat material.

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## Floor and ceiling functions

In mathematics and computer science, the floor function is the function that takes as input a real number x and gives as output the greatest integer less than or equal to x, denoted \operatorname(x).

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## Geometric mean

In mathematics, the geometric mean is a mean or average, which indicates the central tendency or typical value of a set of numbers by using the product of their values (as opposed to the arithmetic mean which uses their sum).

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## Geometric progression

In mathematics, a geometric progression, also known as a geometric sequence, is a sequence of numbers where each term after the first is found by multiplying the previous one by a fixed, non-zero number called the common ratio.

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## Georg Christoph Lichtenberg

Georg Christoph Lichtenberg (1 July 1742 – 24 February 1799) was a German physicist, satirist, and Anglophile.

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## Gram

The gram (alternative spelling: gramme; SI unit symbol: g) (Latin gramma, from Greek γράμμα, grámma) is a metric system unit of mass.

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## Grammage

Grammage and basis weight, in the pulp and paper and the fabric industries, are the areal density of a paper or fabric product, that is, its mass per unit of area.

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## Inch

The inch (abbreviation: in or &Prime) is a unit of length in the (British) imperial and United States customary systems of measurement now formally equal to yard but usually understood as of a foot.

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## International Organization for Standardization

The International Organization for Standardization (ISO) is an international standard-setting body composed of representatives from various national standards organizations.

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## ISO 128

ISO 128 is an international standard (ISO), about the general principles of presentation in technical drawings, specifically the graphical representation of objects on technical drawings.

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## ISO 217

The ISO 217:2013 standard defines the RA and SRA paper formats.

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## Japanese Industrial Standards

specifies the standards used for industrial activities in Japan.

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## Johann Beckmann

Johann Beckmann (1739–1811) was a German scientific author and coiner of the word technology, to mean the science of trades.

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## Letter (paper size)

Letter or ANSI Letter is a paper size commonly used as home or office stationery in the United States, Canada, Chile, Mexico, the Dominican Republic and the Philippines.

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## Mathematics of paper folding

The art of origami or paper folding has received a considerable amount of mathematical study.

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## Millimetre

The millimetre (International spelling as used by the International Bureau of Weights and Measures; SI unit symbol mm) or millimeter (American spelling) is a unit of length in the metric system, equal to one thousandth of a metre, which is the SI base unit of length.

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## Origami

) is the art of paper folding, which is often associated with Japanese culture.

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## Paper density

Paper density is its mass per unit volume.

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## Paper size

Many paper size standards conventions have existed at different times and in different countries.

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## Photocopier

A photocopier (also known as a copier or copy machine) is a machine that makes paper copies of documents and other visual images quickly and cheaply.

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## Plus-minus sign

The plus-minus sign (±) is a mathematical symbol with multiple meanings.

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## Rectangle

In Euclidean plane geometry, a rectangle is a quadrilateral with four right angles.

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## Silver ratio

In mathematics, two quantities are in the silver ratio (also silver mean or silver constant) if the ratio of the sum of the smaller and twice the larger of those quantities, to the larger quantity, is the same as the ratio of the larger one to the smaller one (see below).

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## Square metre

The square metre (International spelling as used by the International Bureau of Weights and Measures) or square meter (American spelling) is the SI derived unit of area, with symbol m2 (Unicode character). It is the area of a square whose sides measure exactly one metre.

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## Square root of 2

The square root of 2, or the (1/2)th power of 2, written in mathematics as or, is the positive algebraic number that, when multiplied by itself, gives the number 2.

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## University of Cambridge

The University of Cambridge (informally Cambridge University)The corporate title of the university is The Chancellor, Masters, and Scholars of the University of Cambridge.

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## Redirects here:

A0 paper, A0 paper size, A1 paper, A1 paper size, A10 paper, A2 paper, A2 paper size, A3 (paper size), A3 paper, A3 paper size, A4 (paper size), A4 (paper), A4 Paper Size, A4 format, A4 paper, A4 paper size, A4 rectangle, A4 sheet, A5 paper, A5 paper size, A6 paper, A6 paper size, A7 paper, A8 paper, A9 paper, B1 (paper size), B1 (paper), B1 paper, B1 paper size, DIN 476, DIN A0, DIN A1, DIN A10, DIN A2, DIN A3, DIN A4, DIN A5, DIN A6, DIN A7, DIN A8, DIN A9, DIN ISO 216, DIN-A4, ISO 216:1975, ISO A4, ISO A5, ISO paper size, ISO paper sizes, ISO-216, ISO216, Lichtenberg Ratio, Lichtenberg ratio, Lichtenberg's ratio, Metric paper.

## References

[1] https://en.wikipedia.org/wiki/ISO_216