What is a horse with 3 white stocking named?

There isn't a specific name for a horse with three white stockings. "Stocking" is the term used to describe white markings that extend from the coronet (the top of the hoof) to the knee or hock.

Here's how you might describe a horse with three white stockings:

* "Horse with three white stockings" is the most accurate and straightforward way to describe it.

* "Tri-colored" if the horse also has other white markings (like a blaze or a star).

There are no official breed-specific names for this type of marking. It's simply a description of the horse's physical characteristics.