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  2. SPECTRE - Wikipedia

    en.wikipedia.org/wiki/SPECTRE

    SPECTRE ("Special Executive for Counter-intelligence, Terrorism, Revenge and Extortion") [1] is a fictional organisation featured in the James Bond novels by Ian Fleming, as well as films and video games based in the same universe.

  3. Specters of Marx - Wikipedia

    en.wikipedia.org/wiki/Specters_of_Marx

    Specters of Marx: The State of the Debt, the Work of Mourning and the New International (French: Spectres de Marx: l'état de la dette, le travail du deuil et la nouvelle Internationale) is a 1993 book by the French philosopher Jacques Derrida.

  4. Spectrum - Wikipedia

    en.wikipedia.org/wiki/Spectrum

    The spectrum in a rainbow. A spectrum (pl.: spectra or spectrums) [1] is a condition that is not limited to a specific set of values but can vary, without gaps, across a continuum.

  5. Hauntology - Wikipedia

    en.wikipedia.org/wiki/Hauntology

    Hamlet, Prince of Denmark, Act I, Scene IV by Henry Fuseli (1789). Hauntology (a portmanteau of haunting and ontology, also spectral studies, spectralities, or the spectral turn) is a range of ideas referring to the return or persistence of elements from the social or cultural past, as in the manner of a ghost.

  6. Spectral evidence - Wikipedia

    en.wikipedia.org/wiki/Spectral_evidence

    Presumptions whereupon persons may be committed, and, much more, convictions whereupon persons may be condemned as guilty of witchcrafts, ought certainly to be more considerable than barely the accused person's being represented by a specter unto the afflicted; inasmuch as it is an undoubted and notorious thing, that a demon may, by God's ...

  7. Spectrum analyzer - Wikipedia

    en.wikipedia.org/wiki/Spectrum_analyzer

    A spectrum analyzer from 2005 A modern real time spectrum analyzer from 2019. A spectrum analyzer measures the magnitude of an input signal versus frequency within the full frequency range of the instrument.

  8. Astronomical spectroscopy - Wikipedia

    en.wikipedia.org/wiki/Astronomical_spectroscopy

    The Star-Spectroscope of the Lick Observatory in 1898. Designed by James Keeler and constructed by John Brashear.. Astronomical spectroscopy is the study of astronomy using the techniques of spectroscopy to measure the spectrum of electromagnetic radiation, including visible light, ultraviolet, X-ray, infrared and radio waves that radiate from stars and other celestial objects.

  9. Brocken spectre - Wikipedia

    en.wikipedia.org/wiki/Brocken_spectre

    A Brocken spectre within glory rings. A Brocken spectre (British English; American spelling: Brocken specter; German: Brockengespenst), also called Brocken bow, mountain spectre, or spectre of the Brocken is the magnified (and apparently enormous) shadow of an observer cast in mid air upon any type of cloud opposite a strong light source.