Harlequin (color)

Harlequin is the name of the colour that is halfway between green and chartreuse green on the Colour wheel. On color plate 17 in the 1930 book "A Dictionary of Colour", the colour "harlequin" is shown as being on the colour wheel precisely halfway between "green" and "yellow-green" (the colour which was formerly called "yellow-green" is now called "chartreuse green"). 
The first recorded use of "harlequin" as a color name in English was in 1923.