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In 1996, the American National Standards Institute adopted ANSI/ASME Y14.1 which defined a regular series of paper sizes based upon the de facto standard 8 + 1 ⁄ 2 in × 11 in (216 mm × 279 mm) Letter size which it assigned "ANSI A", intended for technical drawings, hence sometimes labeled "Engineering".
All ISO 216, ISO 217 and ISO 269 paper sizes (except some envelopes) have the same aspect ratio, √ 2:1, within rounding to millimetres. This ratio has the unique property that when cut or folded in half widthways, the halves also have the same aspect ratio. Each ISO paper size is one half of the area of the next larger size in the same series ...
An envelope is a common packaging item, usually made of thin, flat material. It is designed to contain a flat object, such as a letter or card. Traditional envelopes are made from sheets of paper cut to one of three shapes: a rhombus, a short-arm cross or a kite. These shapes allow the envelope structure to be made by folding the sheet sides ...
The manner in which the stamped envelope is cut before folding (that is, its knife) vanishes on a cut square. The envelope size disappears, too, with a cut square. In collecting entires, a single indicium may appear on many different sizes of envelopes. Some countries have issued the same indicium on different paper types: laid and wove ...
A padded envelope, also known as a padded or cushioned mailer, or jiffy bag in the United Kingdom, is an envelope incorporating protective padding to protect items during shipping. The padding is usually thick paper, bubble wrap , or foam.
Poison Profits. A HuffPost / WNYC investigation into lead contamination in New York City
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Envelope (radar), the volume of space where a radar system is required to reliably detect an object; Envelope (waves), a curve outlining the peak values of an oscillating waveform or signal; Envelope detector, an electronic circuit used to measure the envelope of a waveform; Flight envelope, the limits within which an aircraft can operate