That phrase is what is known as a mneumonic device. The capital letters stand for colors, which are: red, orange, yellow, green, blue, indigo, violet. These are the colors of the rainbow (although indigo is often omitted from the list, being very similar to blue).
Red Orange Yellow Green Blue Indigo Violet The order can be remembered by this mnemonic: Richard Of York Gave Battle In Vain.
Richard of York gave battle in vain.
the colours of the rainbow
Red Orange Yellow Green Blue Indigo Violet its Richard Of York Gave Battle In Vain :)
7 Red, Orange, Yellow, Green, Blue, Indigo, Violet Richard Of York Gave Battle In Vain
Red = Richard Orange = Of Yellow = York Green = Gave Blue = Battle Indigo = In Violet = Vain
Red, Orange, Yellow, Green, Blue, Indigo, Violet. You can remember it by thinking of the poem- Richard Of York Gave Battle In Vain.
seven ROYGBIV [Richard of York gave battle in vain] red orange yellow green blue indigo violet
Red, Orange, Yellow, Green, Blue, Indigo, and Violet.'Richard Of York Gave Battle In Vain' is a popular mnemonic.
Rainbows are formed through refraction. The refraction happens through the rain drops, causing the light (which is made up of a spectrum of colours) to split and causes a rainbow. Richard Of York Gave Battle In Vain -> Red, Orange, Yellow, Green, Blue, Indigo and Violet. This is the order in which it refracts.
Richard Of York Gave Battle In Vain. Red Orange Yellow Green Blue Indigo and Violet. (Richard Plantagenet (1411-1460), Duke of York, was descended in many ways from Edward III and had the strongest claim to the English throne. The English Parliament named him heir of Henry VI, but Henry's wife, Queen Margaret, raised a rebellion in favor of her son, Edward, who had been passed over. Richard went into battle but was killed. So he gave battle in vain.)
Red, Orange, Yellow, Green, Blue, Indigo, Violet.Most people remember them by learning the phrase "Richard of York gave battle in vain" which has the same initial letters.