@GracieAnne it's upside down alpha, there are some tutorials on yt how to make it. I tried to figure it out but I found the easier way for me is just knotting as usual but switching string on top - when switching strings you don't tuck them in the back but just move them out of the way. That way the back gets nice and clean and the top gets messy. You gotta be careful though, because the image gets mirrored, that's not as important for pictures but can be if you're writing something on the bracelet.
@GracieAnne I think they used the Flat Alpha Technique. Which you make your knots under rather than the traditional way of over the other string. Masha Knots and Alex Innovations on YouTube have great tutorials. 😉