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
The government's five-color code alert system is going the way of cold war survival biscuits.
The rail system may seem complex, but the secret is knowing the color code of the line that stops nearest your destination.
There is a color code to food, meaning that if you pick the right color, there can be a nutritional payoff.
You'll learn the seat pitch and width, and you'll be able to instantly see which seats are the best based on a color code.
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