Parti-color: is white with any other color distributed in patches with a white blaze preferred on the head. Ticking is undesirable.
Extreme Piebald: White with patches of color on head and base of tail.
Piebald: White with patches of color on head, body, and base of tail.
Irish: Color on the head and body with white legs, chest and collar.
Particolored Pomeranians are the Mensa candidates of the Pomeranian World. If you have owned a parti color Pomeranian you will never want any another colour Pomeranian to share your life. I probably should have reworded that statement to read; if you have ever been owned by a Parti Pomeranian!
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References and Further Reading
 Denise Leo “The Pomeranian Handbook”.