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  2. Greek letters used in mathematics, science, and engineering

    en.wikipedia.org/wiki/Greek_letters_used_in...

    Greek letters are used in mathematics, science, engineering, and other areas where mathematical notation is used as symbols for constants, special functions, and also conventionally for variables representing certain quantities.

  3. Breast cancer research stamp - Wikipedia

    en.wikipedia.org/wiki/Breast_cancer_research_stamp

    1998 USPS Breast Cancer research semi-postal Stamp. The breast cancer research stamp (BCRS) is a semi-postal non-denominated postage stamp issued by the United States Postal Service, priced in 2011 as eleven cents higher than the standard first-class letter rate.

  4. Postmark - Wikipedia

    en.wikipedia.org/wiki/Postmark

    A postmark [1] is a postal marking made on an envelope, parcel, postcard or the like, indicating the place, date and time that the item was delivered into the care of a postal service, or sometimes indicating where and when received or in transit.

  5. List of U.S. state and territory abbreviations - Wikipedia

    en.wikipedia.org/wiki/List_of_U.S._state_and...

    2-letter and 2-digit codes from the ANSI standard INCITS 38:2009 (supersedes FIPS 5-2) USPS: 2-letter codes used by the United States Postal Service USCG: 2-letter codes used by the United States Coast Guard (bold red text shows differences between ANSI and USCG) Abbreviations: GPO

  6. United States Postal Service irradiated mail - Wikipedia

    en.wikipedia.org/wiki/United_States_Postal...

    The USPS warned that a number of products could be adversely affected, such as seeds, photographic film, biological samples, food, medicines, and electronic equipment. In the process of irradiation, mail is exposed to extreme heat. Paper is weakened and may appear to have been aged, with discoloration (e.g., yellowing), and brittleness.

  7. Postal Regulatory Commission - Wikipedia

    en.wikipedia.org/wiki/Postal_Regulatory_Commission

    The Postal Accountability and Enhancement Act of 2006 (Public Law 109-435) enacted on December 20, 2006, made several changes to the Postal Regulatory Commission. [2] [3] Besides giving the body its current name, the Postal Accountability and Enhancement Act significantly strengthened the Commission's authority to serve as a counterbalance to new flexibility granted to the USPS in setting ...

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