An audio WAVEFORM theoretically comprised of an infinite set of odd harmonic SINE WAVEs. It is often used in SOUND SYNTHESIS.
See also: FOURIER THEOREM, LAW OF SUPERPOSITION, OSCILLATOR, SWITCH. Compare: PULSE, SAWTOOTH WAVE, TRIANGLE WAVE.
Square wave, its description as a Fourier series, and as a line spectrum.
Sound Example: Square wave at 100 Hz.