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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 also refer to:

Science and technology

Physics

• Electromagnetic spectrum
  • Visible spectrum or optical spectrum, a subset of the electromagnetic spectrum
  • Emission spectrum, observed in light
  • Absorption spectrum, observed in light
  • Radio spectrum, radio frequency subset of the electromagnetic spectrum
  • Stellar spectrum, the combination of continuum, absorption, and emission lines produced by a star
• Energy spectrum, of a collection of particles (particle physics)
• Frequency spectrum, of a signal
• Power spectrum, of a signal

Medicine

• Spectrum disorder, a group of mental disorders of similar appearance or thought to share an underlying mechanism
  • Autism spectrum, encompassing autism, Asperger's, etc.
• Antimicrobial spectrum, the range of microorganisms an antibiotic can kill or inhibit

Mathematics

In mathematics, spectrum frequently denotes a set of numbers associated to an object:

• Spectrum of a matrix, its set of eigenvalues, in linear algebra
  • Spectrum (functional analysis), a generalization of the concept of matrix eigenvalues to operators
  • Spectrum of a graph, studied in spectral graph theory
  • Pseudospectrum
• Spectrum of a polygon, the set of numbers of possible equidissections
• Spectrum of a sentence, in mathematical logic
• Spectrum of a theory, in mathematical logic

There are also several other, unrelated meanings:

• Spectrum (topology), the fundamental object of study in stable homotopy theory
• Spectrum of a C*-algebra, a kind of dual object
• Spectrum of a ring, the set of its prime ideals, in commutative algebra

Arts and entertainment

• Spectrum (brand), a brand name used by Charter Communications for their telecommunication services, including:
  • Spectrum News, a group of six cable news channels
  • Spectrum Sports, a group of nine regional sports networks in the US
  • Spectrum TV Stream, a streaming service

Publications

• IEEE Spectrum, a magazine by the Institute of Electrical and Electronics Engineers
• Spectrum (magazine), an independent Seventh-day Adventist magazine
• Spectrum (newspaper), a defunct Toledo, Ohio weekly newspaper
• Spectrum, a news website published by the Simons Foundation Autism Research Initiative
• The Spectrum (Utah), also known as The Spectrum & Daily News, a Gannett newspaper in St. George, Utah
• Spectrum (novel), a 2002 novel by Russian author Sergey Lukyanenko
• Spectrum, a magazine published with Scotland on Sunday
• Spectrum, a liftout in The Sydney Morning Herald

Student newspapers

• The Spectrum (USLS), the student newspaper of the University of St. La Salle in the Philippines
• The Spectrum (NDSU), the student newspaper of the North Dakota State University in the United States
• The Spectrum (University at Buffalo), the student newspaper of the State University of New York at Buffalo

Television

• Spectrum (TV channel), a defunct Chicago-area pay television broadcaster founded by United Cable
• Spectrum (TV series), a 1958 Canadian television series
• Spectrum (radio program), a daily broadcast series on CBS Radio, c. 1970–1992

Music

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

Groups

• Spectrum (band), an Australian group of the 1970s led by Mike Rudd
• Spectrum (group), a South Korean boy group formed in 2018
• Spectrum, a British band led by Peter Kember
• Spectrum, a bluegrass band that included Béla Fleck and Jimmy Gaudreau
• Spectrum (The Carpenters), 1960s jazz band led by Richard and Karen Carpenter
• The Spectrum (1964–1970), a London-based pop group coincidentally providing the closing theme for the spectrum-themed TV show Captain Scarlet and the Mysterons

Albums

• Spectrum (Billy Cobham album), debut album of fusion drummer Billy Cobham
• Spectrum (Cedar Walton album), the second album by jazz pianist Cedar Walton
• Spectrum (Jega album), debut album of electronic musician Jega
• Spectrum (Steve Howe album), 2005
• Spectrum (Illinois Jacquet album), 1965
• Spectrum (Westlife album), 2019
• The Spectrum (album), of 2017 by Daley
• Spectrum (Hiromi album), 2019
• Spectrum, by iamjakehill, 2017

Songs

• "Spectrum (Say My Name)", a 2012 song by British indie rock band Florence and the Machine
• "Spectrum" (Zedd song), a 2012 song by German electronic dance music producer Zedd; also covered by SM The Performance
• "Spectrum", a 2017 song by musical artist Muzz

Other arts and entertainment

• Spectrum, a news website founded by the Simons Foundation Autism Research Initiative
• Monica Rambeau, a Marvel Comics character who uses the name Spectrum
• Spectrum, the worldwide security organisation in the 1960s TV series Captain Scarlet and the Mysterons
• Gaylactic Spectrum Awards or Spectrums, a literary award
• Spectrum Award, in fantasy, science fiction, and horror artwork

Buildings and structures

• Spectrum (Montreal), a defunct concert venue in Canada
• Spectrum London, an art gallery in England
• Guildford Spectrum, a leisure complex in Guildford, England
• Smith Spectrum, a sports arena in Logan, Utah, US
• Spectrum (arena), a former arena in Philadelphia, Pennsylvania, US
• Spectrum Stadium, near Orlando, Florida, US
• Northlands Spectrum, later known as Northlands Park, a horse racing track in Edmonton, Alberta, Canada

Organizations

• Spectrum Aircraft, a Canadian ultralight aircraft manufacturer
• Spectrum Aeronautical, a US-based manufacturer of very light jets
• Spectrum Animation, a defunct Japanese animation studio
• Spectrum Brands, an American home-essentials company
• Het Spectrum, a Dutch publishing company
• Spectrum Pharmaceuticals, an American biopharmaceutical company
• Spectrum (Amsterdam) (formerly Librije's Zusje), Michelin-starred restaurant in Amsterdam, the Netherlands

Products

• Spectrum (racing car), a series of Australian open wheel racing cars manufactured by Borland Racing Developments
• Chevy Spectrum, a North American car also sold as the Geo Spectrum
• ZX Spectrum, an early British home computer by Sinclair
• Spectrum, a brand of printer paper owned by Georgia-Pacific

Other uses

• Economic spectrum, disparities between social classes
• Political spectrum, of opinion
• Spectrum Range, a mountain range in British Columbia, Canada
• Spectrum (horse), a thoroughbred racehorse
• SPECTRUM Standard, a Museum Collections Management Standard developed by the Collections Trust

See also

• Spectral music
• Spector (disambiguation) or Spektor
• Spectre (disambiguation) or Specter
• Spectra (disambiguation)
• Spectral (disambiguation)
• Spektrum (disambiguation)