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2. Back-of-the-envelope calculation - Wikipedia

   en.wikipedia.org/wiki/Back-of-the-envelope...

   Back-of-the-envelope calculation. 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 ...

3. Envelope - Wikipedia

   en.wikipedia.org/wiki/Envelope

   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 ...

4. Paper size - Wikipedia

   en.wikipedia.org/wiki/Paper_size

   B4, B5, and B6 are used for envelopes that will hold C-series envelopes. B4 is quite common in printed music sheets. B5 is a relatively common choice for books. B7 is equal to the passport size ID-3 from ISO/IEC 7810. Many posters use B-series paper or a close approximation, such as 50 cm × 70 cm ~ B2.

5. Stamped envelope - Wikipedia

   en.wikipedia.org/wiki/Stamped_envelope

   Stamped envelope. A 2 centavos stamped envelope with embossed Columbus indicium and 3c adhesive postage stamp from Cuba to Norway ca. 1904. A stamped envelope or postal stationery envelope ( PSE) is an envelope with a printed or embossed indicium indicating the prepayment of postage. It is a form of postal stationery .

6. Self-addressed stamped envelope - Wikipedia

   en.wikipedia.org/.../Self-addressed_stamped_envelope

   Self-addressed stamped envelope. A self-addressed stamped envelope ( SASE ), [ 1][ 2] stamped self-addressed envelope ( SSAE ), [ 3] or stamped addressed envelope ( SAE) [ 4] is an envelope with the sender's name and address on it, plus affixed paid postage, that is mailed to a company or private individual.

7. Letter (paper size) - Wikipedia

   en.wikipedia.org/wiki/Letter_(paper_size)

   In the US, paper density is usually measured in "pound per reams " (of 500 sheets). Typical Letter paper has a basis weight of paper of 20 or 24 pounds (9.1 or 10.9 kg) – the weight of 500 sheets (a ream) of 17-by-22-inch (431.8 by 558.8 mm) paper at 70 °F (21 °C) and at 50% humidity. [ 3] One ream of 20-pound Letter-sized paper weighs 5 ...