ROYGBIV is an acronym for the sequence of hues commonly described as making up a rainbow: red, orange, yellow, green, blue, indigo and violet.

Richard Of York Gave Battle In Vain — a traditional mnemonic device used to turn the initial letters of seven spectral colors into a sentence.  

Richard Of York Gave Battle In Vain. Ihar Hancharuk
Richard Of York Gave Battle In Vain. Ihar Hancharuk
Richard Of York Gave Battle In Vain. Ihar Hancharuk
Richard Of York Gave Battle In Vain. Ihar Hancharuk
Richard Of York Gave Battle In Vain. Ihar Hancharuk
Richard Of York Gave Battle In Vain. Ihar Hancharuk
Richard Of York Gave Battle In Vain. Ihar Hancharuk