With such a large variety of colors, the markings make Pomeranians very unique. The common markings are sable, merle, parti, and brindle.
Brindle - base undercoat of a light color (tan, orange, etc.) and then there will be stripes running over that color.
Parti - when the Pom has two colors, one being white. (A tri-parti has 3 colors).
Sable - dark tipped hairs that can appear on just about any base color.
Merle - splattering effect of a color on the coat