J.B.
Pinch pleat - the hooks go into the pleats and then those hooks hang from the dangly things on the rod. I have traverse rods all over my house (the previous owner was 72 and had lived here for 54 years).
If you find pocket rod drapes that you love, you can convert them to pinch pleat with special 3-pronged hooks that gather the fabric into a pinch pleat without sewing. They're kind of a pain but easier than sewing and less expensive than having custom made drapes. Pinch pleat drapes are voluminous and use a lot of fabric but if you like the look, you can definitely find them!