It's a split 9 patch block. You can create many different quilts based on the setting.
Here is a picture of an Amish one
http://www.amishcountrylanes.com/Pages/hs15.shtml
Edited to add, I've also seen it called a broken 9P and a fractured 9P. Basically it is a standard 9P block with some strategically placed HST replacing some of the squares of the 9Patch