The half square triangle unit is probably the most commonly used patch in a quilt block -- well it is second only to the square. It is made simply with two triangles, filling up half the square each -- hence the name. Take a quick look through this website, or in any quilting magazine, and you will start to notice that this half square triangle, regardless of its size, is present in more quilts than not.
Free Quilt Block Pattern
The Jawhawks quilt block is a new one to me ... well at least the name. The patches used in this block are easy to create and therefore this block is a good choice for a beginner quilter.
The nine patch block uses the half square triangle patch for each corner. Flying geese patches are also featured, and if you are a steady reader of this website, you will know that flying geese are my favourite patches. (I have no idea why that is, but I just like to work with them.)
The sample quilts illustrated appear to be similar, but one quilt has the blocks set side by side with sashing strips in between and the second quilt features blocks set on point. Any way you choose to lay out the blocks in your quilt will produce a pleasing and unique end product. That is what makes quilting such a fun and creative activity -- rarely do two quilts using the same blocks look the same!