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  2. Library of Congress Control Number - Wikipedia

    en.wikipedia.org/wiki/Library_of_Congress...

    In its most elementary form, the number includes a year and a serial number. The year has two digits for 1898 to 2000, and four digits beginning in 2001. The three ambiguous years (1898, 1899, and 1900) are distinguished by the size of the serial number.

  3. Number density - Wikipedia

    en.wikipedia.org/wiki/Number_density

    Number density. The number density (symbol: n or ρN) is an intensive quantity used to describe the degree of concentration of countable objects ( particles, molecules, phonons, cells, galaxies, etc.) in physical space: three-dimensional volumetric number density, two-dimensional areal number density, or one-dimensional linear number density.

  4. Telephone numbers in Egypt - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_Egypt

    Telephone numbers in Egypt. 20 is the international dialing country code for Egypt . The telephone numbers are designated under the 2003 Telecom Act created by the Egyptian Ministry of Communications and Information Technology. [1]

  5. Rossby number - Wikipedia

    en.wikipedia.org/wiki/Rossby_number

    The Rossby number ( Ro ), named for Carl-Gustav Arvid Rossby, is a dimensionless number used in describing fluid flow. The Rossby number is the ratio of inertial force to Coriolis force, terms and in the Navier–Stokes equations respectively. [1] [2] It is commonly used in geophysical phenomena in the oceans and atmosphere, where it ...

  6. Telephone numbers in Europe - Wikipedia

    en.wikipedia.org/wiki/Telephone_numbers_in_Europe

    Calling codes in Europe. Telephone numbers in Europe are managed by the national telecommunications authorities of each country. Most country codes start with 3 and 4, but some countries that by the Copenhagen criteria are considered part of Europe have country codes starting on numbers most common outside of Europe (e.g. Faroe Islands of Denmark have a code starting on number 2, which is most ...

  7. Transcendental number - Wikipedia

    en.wikipedia.org/wiki/Transcendental_number

    Transcendental number. In mathematics, a transcendental number is a real or complex number that is not algebraic – that is, not the root of a non-zero polynomial of finite degree with rational coefficients. The best-known transcendental numbers are π and e. [1] [2] The quality of a number being transcendental is called transcendence .

  8. Azimuthal quantum number - Wikipedia

    en.wikipedia.org/wiki/Azimuthal_quantum_number

    The principal quantum number ( n) is shown at the right of each row. In quantum mechanics, the azimuthal quantum numberℓ is a quantum number for an atomic orbital that determines its orbital angular momentum and describes aspects of the angular shape of the orbital. The azimuthal quantum number is the second of a set of quantum numbers that ...

  9. List of Marvel Cinematic Universe films - Wikipedia

    en.wikipedia.org/wiki/List_of_Marvel_Cinematic...

    Phase Four 's group of films began with Black Widow (2021), and was followed by Shang-Chi and the Legend of the Ten Rings (2021), Eternals (2021), Spider-Man: No Way Home (2021), Doctor Strange in the Multiverse of Madness (2022), Thor: Love and Thunder (2022), and Black Panther: Wakanda Forever (2022).