[Edit]

top

The Spectrum article explains why so many things are called by this name

The spectrum of activity of a drug

The political spectrum of opinion

The economic spectrum

The bipolar spectrum, in psychiatry

The autistic spectrum, in psychiatry

top

The electromagnetic spectrum

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

An emission spectrum or absorption spectrum observed in light

The spectral class of stars (astronomy)

The spectral class of asteroids (astronomy)

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

The frequency spectrum of a signal

The power spectrum of a signal

The timbre of a musical note, a spectrum of sound energy

top

The spectrum of a matrix is a concept used in linear algebra

The spectrum of an operator is a concept used in functional analysis (a generalisation of the spectrum of a matrix)

The spectrum of a ring is a concept in commutative algebra

The spectrum of a C*-algebra

A spectrum (homotopy theory)

The Stone space of a Boolean algebra

The spectrum of a theory is a concept in mathematical logic

top

IEEE Spectrum, a magazine

The ZX Spectrum, a computer

Spectrum Suite of service management products

A fictional international security organisation in the television series Captain Scarlet

The Spectrum Awards (Gaylactic Spectrum Awards) are a literary award.

Spectrum Radio, an AM station based in London.

Spectral Sound, a record label

Companies:

Het Spectrum, or "Uitgeverij Het Spectrum", a Dutch publishing house

Spectrum Strategy Consultants, a management consulting firm

Music groups:

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

A more recent group headed by Peter Kember

Buildings:

The Smith Spectrum, a sports arena in Logan, Utah

The Wachovia Spectrum, formerly The Spectrum, a sports arena in Philadelphia

The Spectrum Leisure Centre, in Guildford, England

Spectrum London, an art gallery.

top

Spectre

Cepstrum