Etymology

Joy plot

Today it means: A plot of a repetitive signal, by repeatedly plotting each period on a separate line one under another, to create a pseudo-3D image that appears like a mountainous ridge. Full definition →

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The story

Blend of Joy Division + plot, from a plot that was made famous by the band Joy Division, who used the plotting of a signal from pulsar CP1919 as the cover image for their 1979 album Unknown Pleasures.

Etymology from Wiktionary, CC BY-SA 4.0.