OK, next one, what is this used for?
Bye, bye Rosie, off you go, Birmingham via great Western. Seasons greetings.
.... no cheating!
Mnemonic rhyme for Resistor Colour Codes. Too many years in electronic engineering - sorry
Black, Brown, Red, Orange, Yellow, Green, Blue, Violet, White. ( 1,2,3,4,5,6,7,8,9,0 )