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  2. Envelope (waves) - Wikipedia

    en.wikipedia.org/wiki/Envelope_(waves)

    In physics and engineering, the envelope of an oscillating signal is a smooth curve outlining its extremes. [1] The envelope thus generalizes the concept of a constant amplitude into an instantaneous amplitude. The figure illustrates a modulated sine wave varying between an upper envelope and a lower envelope. The envelope function may be a ...

  3. First day of issue - Wikipedia

    en.wikipedia.org/wiki/First_day_of_issue

    First day cover of the Alexander Graham Bell issue of 1940. A first day of issue cover or first day cover (FDC) is a postage stamp on a cover, postal card or stamped envelope franked on the first day the issue is authorized for use [1] within the country or territory of the stamp-issuing authority.

  4. Postage stamp - Wikipedia

    en.wikipedia.org/wiki/Postage_stamp

    The main components of a stamp: 1. Image 2. Perforations 3. Denomination 4. Country name. A postage stamp is a small piece of paper issued by a post office, postal administration, or other authorized vendors to customers who pay postage (the cost involved in moving, insuring, or registering mail).

  5. Postcard - Wikipedia

    en.wikipedia.org/wiki/Postcard

    New Year's Day postcards serve as greeting cards, similar to Western Christmas cards, while return postcards function similarly to a self-addressed stamped envelope, allowing one to receive a reply without burdening the addressee with postage fees. Return postcards consist of a single double-size sheet, and cost double the price of a usual ...

  6. Cover (philately) - Wikipedia

    en.wikipedia.org/wiki/Cover_(philately)

    1856 cover posted in New York City with three 1-cent stamps affixed. In philately, the term cover pertains to the outside of an envelope or package with an address, typically with postage stamps that have been cancelled and is a term generally used among stamp and postal history collectors.

  7. Gettysburg Address - Wikipedia

    en.wikipedia.org/wiki/Gettysburg_Address

    The Gettysburg Address is a speech that U.S. President Abraham Lincoln delivered during the American Civil War at the dedication of the Soldiers' National Cemetery, now known as Gettysburg National Cemetery, in Gettysburg, Pennsylvania on the afternoon of November 19, 1863, four and a half months after the Union armies defeated Confederate forces in the Battle of Gettysburg, the Civil War's ...

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