Harlequin

I found this on the cat fancier's web site at www.fanciers.com

Cats with white markings might have larger or smaller areas of white. If you want to describe your cat's color more precisely, there are different names for the different amounts of white:

A "mitted" cat just has white paws.
A cat with a white spot on its chest has a "locket."
A cat with one or more little white belly spots has "buttons."
A "bi-color" is about half white.
A "harlequin" is mostly white with several large patches of color.
A "van" is almost all white with color patches only on the head and tail.