SPECTRUM (DISAMBIGUATION)

A 'spectrum' is a condition or value that is not limited to a specific set of values but can vary infinitely within a continuum.
'Spectrum' may refer more specifically to:
;In physical sciences

★ The electromagnetic spectrum

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★ The visible spectrum or optical spectrum, a subset of the electromagnetic spectrum

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★ An emission spectrum observed in light

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★ An absorption spectrum observed in light

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★ The spectral class of stars in Stellar classification

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★ The spectral class of asteroids

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★ The spectral power distribution of an illuminant

★ The energy spectrum of a collection of particles (particle physics)

★ The frequency spectrum of a signal

★ The power spectrum of a signal

★ The timbre (spectrum of sound energy) of a musical note

★ The spectrum of activity of a chemical
;In social and medical sciences

★ The economic spectrum

★ The political spectrum of opinion

★ A spectrum disorder, in psychiatry
;In mathematics

★ The spectrum of a matrix, in linear algebra

★ The spectrum of an operator, in functional analysis (a generalisation of the spectrum of a matrix)

★ The spectrum of a ring, in commutative algebra

★ The spectrum of a C
★ -algebra

★ A spectrum (homotopy theory)

★ The Stone space of Boolean algebra

★ The spectrum of a theory, in mathematical logic
;In media

★ ''IEEE Spectrum'', a magazine

★ ''Spectrum'' (magazine), published by the Seventh-day Adventist Church

★ The Spectrum (Sirius), a music channel on Sirius Satellite Radio

★ The Spectrum (USLS), the student newspaper of the University of St. La Salle in the Philippines

★ Spectrum (TV channel), a defunct Chicago-area pay television broadcaster founded by United Cable

★ Spectrum (band), an Australian group of the 1970s led by Mike Rudd

★ Spectrum, a band headed by Peter Kember

★ Spectrum (album), debut album of fusion drummer, Billy Cobham
;Buildings

★ The Smith Spectrum, a sports arena in Logan, Utah, U.S.A.

★ The Wachovia Spectrum, formerly ''The Spectrum'', a sports arena in Philadelphia, Pennsylvania, U.S.A.

★ Guildford Spectrum, a leisure complex in Guildford, England

★ Spectrum London, UK, an art gallery

★ Spectrum (Montreal), a defunct concert venue and local landmark.
;Other

★ The ZX Spectrum, an early British home computer

★ Het Spectrum, a Dutch publishing company

★ Spectrum Strategy Consultants, a management consulting firm

★ The Gaylactic Spectrum Awards or Spectrums, a literary award

★ Spectrum (racing car), a series of Australian open wheel racing cars manufactured by Borland Racing Developments