color code

noun
any system of marking or visual designation that uses specific colors for indicating or simplifying, as on a chart or map or in an industrial plant.
Dictionary.com Unabridged

color-code

[kuhl-er-kohd]
verb (used with object), color-coded, color-coding.
to distinguish or classify with a color code.

Origin:
1955–60

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
For a long time now, it's been possible to color-code events by sub-calendar.
Researchers color-code these features according to wavelength or temperature.
Participants color-code the three drawings-green for go, yellow for caution, and red for stop.
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