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  2. Windowed envelope - Wikipedia

    en.wikipedia.org/wiki/Windowed_envelope

    Windowed envelope. US Patent 701,839 for a windowed envelope. Modern envelope with a single window for the recipient address. A windowed envelope is a conventional envelope with a transparent (typically PET or BOPS Bi-oriented polystyrene [1] plastic film) window to allow the recipient's address to be printed on the paper contained within.

  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.

  4. Window function - Wikipedia

    en.wikipedia.org/wiki/Window_function

    Most popular window functions are similar bell-shaped curves. In signal processing and statistics, a window function (also known as an apodization function or tapering function [1]) is a mathematical function that is zero-valued outside of some chosen interval. Typically, window functions are symmetric around the middle of the interval ...

  5. Overton window - Wikipedia

    en.wikipedia.org/wiki/Overton_window

    The Overton window is the range of policies politically acceptable to the mainstream population at a given time. [ 1] It is also known as the window of discourse. The term is named after the American policy analyst Joseph Overton, who proposed that an idea's political viability depends mainly on whether it falls within this range, rather than ...

  6. Hann function - Wikipedia

    en.wikipedia.org/wiki/Hann_function

    Hann function. The Hann function is named after the Austrian meteorologist Julius von Hann. It is a window function used to perform Hann smoothing. [1] The function, with length and amplitude is given by: For digital signal processing, the function is sampled symmetrically (with spacing and amplitude ): which is a sequence of samples, and can ...

  7. AOL Mail

    mail.aol.com

    You can find instant answers on our AOL Mail help page. Should you need additional assistance we have experts available around the clock at 800-730-2563.

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