Showa Sanshoku, more commonly known as Showa, are koi that display white and red/orange patterns over top of a black base color. Showa can be easily confused with Sanke. In Showa, the black patterns will wrap all the way around the body, instead of appearing only on the top half of the body. Also, Showa will have black patterns on the head, and Sanke will not.
The red, white and black should be balanced about the body evenly, with crisp, clean edges between each color.