Dappled - These typically show up on grey horses but can be found on other colors too. Model horse dapples can sometimes be tiny pin point marks or larger round marks. They can be lighter or darker than the horse's coat color. They can appear all over the horse or in just one area.
from Special Run #710295 Race Horses of America
Shaded grey, dappled, darker points, hind legs and face fade to white
#82 Clydesdale Stallion
Glossy, grey, dappled, darker points, legs and face fade to white, gold ribbons
Shaded grey, dappled, darker points, stripe and white muzzle, socks