Spectrum (disambiguation)

• Continuous spectrum, of any physical quantity that can change smoothly
• Discrete spectrum
• 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

• 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

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

• 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
• 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 liftout in The Sydney Morning Herald

• 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, US
• The Spectrum (University at Buffalo), the student newspaper of the University at Buffalo, US

• 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

• Spectrum (UK band), lead by Peter Kember
• Spectrum (band), an Australian group of the 1970s led by Mike Rudd
• Spectrum (group), a South Korean boy group formed in 2018
• Spectrum, a bluegrass band that included Béla Fleck and Jimmy Gaudreau
• Spectrum (The Carpenters), 1960s jazz band led by Richard and Karen Carpenter
• 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
• "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
• The Spectrum (Sirius XM), a music channel on Sirius Satellite Radio
• 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
• The Spectrum (album), of 2017 by Daley
• Spectrum (Hiromi album), 2019

• 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