I believe it was called String X block. Here's a link to Danke's quilt.
April Showers, a string-x quilt
Unfortunately the blog she referred to is gone.
Edit: Just found another tutorial for the block.
You will have to check if the dimensions correspond
to your block. Might have to make a few adjustments.
http://www.mypurplepatch.com/2016/03...g-x-quilt.html