a calico cat, with tortoiseshell marking.

They are believed to be good luck
Even today, these cats are prominent figures for the superstitious. Many people believe Tortoiseshell Cats to be good luck. In the United States, they are even referred to as “money cats.” Clearly, these cats have a much more important role in the lives of some owners than just being a pet.

http://kittentoob.com/cat-breeds/tortoiseshell-cat/