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 Forest Campfire quilt block is an easy nine patch block containing one of my favourite patches - flying geese units. Secondly, it features three quarter square triangle patches, so named as the patch contains three triangles filling up a square. The unit itself is made using both half square triangles and quarter square triangles.
The sample quilts illustrated feature blocks set side by side as well as on point with sashing to give two totally different looks in the end.
Related - Campfire Star