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That tells you exactly what your horse has for the many color and pattern genes that determine what a horse looks like. It shows up if you or any previous owner pay for the Color Testing found in the left column of the stable pages. If the test has been done, you will see the "short" color name that would describe your horse--Chestnut Tobiano, White Black, Amber Champagne Splash, to name a few possibilities--in the center column of information under its picture.

If you scroll down a bit, this thread gives a fairly thorough discussion of what all the various color genes do.

http://www.huntandjump.com/forum/discussion/3238/horse-level-genetic-symbols#Item_5