This is an origami crimp fold.
The origami crimp fold will allow you to bend a strip at an angle. If you understand how a crimp fold works, you will not have to create pre-creases as a guide like this example.
|Step 1: Let's create a couple of pre-creases to help us make a crimp. We will use this folded stip as an example. Fold a part of the right side to the left.|
|Step 2: Starting at the top of the crease, fold at an angle, then unfold.|
|Step 3: Open the paper and push the right part into the left using the creases as a guide.|