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  2. Fallen angel - Wikipedia

    en.wikipedia.org/wiki/Fallen_angel

    The Fallen Angels (1893), by Salvatore Albano. Brooklyn Museum, New York City. Fallen angels are angels who were expelled from Heaven.The literal term "fallen angel" does not appear in any Abrahamic religious texts, but is used to describe angels cast out of heaven [1] or angels who sinned.

  3. Nazi symbolism - Wikipedia

    en.wikipedia.org/wiki/Nazi_symbolism

    Many symbols used by the Nazis have further been appropriated by neo-Nazi groups, including a number of runes; the so-called Black Sun, derived from a mosaic floor in Himmler's remodel of Wewelsburg; and the Celtic cross, originally a symbol used to represent pre-Christian and Christian European groups such as the Irish. [citation needed]

  4. Wavenumber - Wikipedia

    en.wikipedia.org/wiki/Wavenumber

    Diagram illustrating the relationship between the wavenumber and the other properties of harmonic waves. In the physical sciences, the wavenumber (or wave number), also known as repetency, [1] is the spatial frequency of a wave, measured in cycles per unit distance (ordinary wavenumber) or radians per unit distance (angular wavenumber).

  5. Imaginary number - Wikipedia

    en.wikipedia.org/wiki/Imaginary_number

    An imaginary number is the product of a real number and the imaginary unit i, [note 1] which is defined by its property i 2 = −1. [1] [2] The square of an imaginary number bi is −b 2. For example, 5i is an imaginary number, and its square is −25. The number zero is considered to be both real and imaginary. [3]

  6. Transcendental number - Wikipedia

    en.wikipedia.org/wiki/Transcendental_number

    In other words, the n th digit of this number is 1 only if n is one of the numbers 1! = 1, 2! = 2, 3! = 6, 4! = 24, etc. Liouville showed that this number belongs to a class of transcendental numbers that can be more closely approximated by rational numbers than can any irrational algebraic number, and this class of numbers are called Liouville ...

  7. Number - Wikipedia

    en.wikipedia.org/wiki/Number

    More universally, individual numbers can be represented by symbols, called numerals; for example, "5" is a numeral that represents the number five. As only a relatively small number of symbols can be memorized, basic numerals are commonly organized in a numeral system, which is an organized way to

  8. Social networking service - Wikipedia

    en.wikipedia.org/wiki/Social_networking_service

    Illustrations showing various icons of some popular social networking services. A social networking service (SNS), or social networking site, is a type of online social media platform which people use to build social networks or social relationships with other people who share similar personal or career content, interests, activities, backgrounds or real-life connections.

  9. Trademark symbol - Wikipedia

    en.wikipedia.org/wiki/Trademark_symbol

    The trademark symbol ™ is a symbol to indicate that the preceding mark is a trademark, specifically an unregistered trademark. It complements the registered trademark symbol ® which is reserved for trademarks registered with an appropriate government agency.