Roy G. Biv is an acronym for the sequence of hues in a rainbow according to how the English language divides the visible light spectrum:
- Red
- Orange
- Yellow
- Green
- Blue
- Indigo
- Violet
A rainbow spans a continuous spectrum of colors; the distinct bands are an artifact of human color vision. In Roy G. Biv, the colors are arranged in the order of decreasing wavelengths, with red being 650 nm and violet being about 400 nm. Other variations are ROYGBIV and VIBGYOR. The Roy G. Biv arrangement is memorable because Roy is a common male given name, forming the acronym into a first name, middle initial, and a last name.
Read more about Roy G. Biv: History