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'''RoyGBiv''' is an [[acronym]] that uses the first letter of each of these colors: ''[[red]], [[Orange (color)|orange]], [[yellow]], [[green]], [[blue]], [[indigo]], [[violet]]'' in order of the color [[spectrum]]. It is pronounced as if it were a name: "Roy G. Biv". Red is the color of lowest energy and violet is the highest-energy color.

'''RoyGBiv''' is an [[mnemonic]] that uses the first letter of each of these colors: ''[[red]], [[Orange (color)|orange]], [[yellow]], [[green]], [[blue]], [[indigo]], [[violet]]'' in order of the color [[spectrum]]. It is pronounced as if it were a name: "Roy G. Biv". Red is the color of lowest energy and violet is the highest-energy color.  In RoyGBiv, the colors are arranged in the order of decreasing wavelengths, with red being 650 nm and violet being about 400 nm.

Some debate exists over whether indigo is distinct from blue and violet on the color spectrum.

Some debate exists over whether indigo is distinct from blue and violet on the color spectrum.