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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 ...
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
The manila envelope, a close relative of the folder, often has a mechanism on the closing flap that allows it to be opened without damaging the envelope so that it can be reused. There are two main methods to achieve this.
Stationery refers to writing materials, including cut paper, envelopes, continuous form paper, and other office supplies. [1] Stationery usually specifies materials to be written on by hand (e.g., letter paper) or by equipment such as computer printers .
Since at least 1915, manila paper has been shaped to create manila file folders and manila envelopes. [5] Attributes. Fashion student using manila paper.
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A back-of-the-envelope calculation is a rough calculation, typically jotted down on any available scrap of paper such as an envelope. It is more than a guess but less than an accurate calculation or mathematical proof. The defining characteristic of back-of-the-envelope calculations is the use of simplified assumptions.
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