I always remember it as ROY-G-BIV, but then maybe I played a little too much Paranoia[1]
[1] https://en.wikipedia.org/wiki/Paranoia_(role-playing_game)
[1] https://en.wikipedia.org/wiki/Paranoia_(role-playing_game)
EDIT: I find multiple Wikipedia articles[1][2] for Indian organizations/events with the VIBGYOR name, which suggests it's cultural. Some guy's/gal's blog[3] also suggests VIBGYOR is from India.
1: https://en.wikipedia.org/wiki/ViBGYOR_Film_Festival 2: https://en.wikipedia.org/wiki/VIBGYOR_Group_of_Schools 3: http://nerdruid.com/druidcraft/science/physics/optics/vibgyo...