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'''RoyGBiv''' is an [[acronym]] that uses the first letter of each of these colors: ''[[Red]], [[Orange]], [[Yellow]], [[Green]], [[Blue]], [[Indigo]], [[Violet]]'' in order of the color [[spectrum]]. Some debate exists over whether indigo is distinct from blue and violet on the color spectrum.

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

 

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

The reason for the "seven" colors is that when they were named from the results of the spectrum thrown by a [[prism]], seven was considered to be a holy number, dating to the seven observable (non-[[star]]) objects in the heavens (the sun, the moon, and the five planets visible to the naked eye).

The reason for the "seven" colors is that when they were named from the results of the spectrum thrown by a [[prism]], seven was considered to be a holy number, dating to the seven observable (non-[[star]]) objects in the heavens (the sun, the moon, and the five planets visible to the naked eye).