Welcome Lennyb,
As far as I can see from this position it is one of the coiled knots, but without seeing the ends I can not say any more. Is it solid string or is it coiled around something else?
What do the ends (top and bottom in your photos) look like?
Is the flipside the same as the side shown?
Do you know where it has been made, like does it come from China or Europe?
Even if we know all the answers to the questions above it might be hard to tell you the name, though we might be able to find it in the books.
But the chances of us being able to tell you how to tie it are much better.
Willeke