Tortoiseshell coats are two colors blended in no distinct pattern. They are often patches of red and black or possibly cream and blue. They are also called patched tabby. The white part of the coat is usually more prominent on the underside of the body, and the colored patches tend to be larger and more distinct than in the tortoiseshell or torbie patterns. Tricolor coats, as the name implies, have three colors.
Calico cats are good examples.