- ROY G. BIV
- Reports Of Young Girls Banging Inside Vatican
- Richard Of York Gave Battle In Vain
- Richard Of York Got Buggered In Venice
Explanation: Mnemonic devices for the order & colors of the rainbow (Red, Orange, Yellow, Green, Blue, Indigo, Violet).
Or reverse/inside out:
Light is just a part of the spectrum of EM-waves: see our mnemonic on all EM-waves