The site took ripped all the images from original source without including the Japanese translation of the crest and just presented on their own blog in a list. Sure, they credited the source, but the idea of ripping all content from another site without really adding much to it seems kind of scummy. For example, if I liked an illustrator, I'd just choose a few of their works to highlight while linking back to their website to see the remainder of images.
It's interesting how the first one looks like a triquetra. John Bonham (of Led Zeppelin) would have no doubt been pleased.
It's a set of Borromean rings, a personal favorite "knot" (really a braid) of mine and a remarkably common occurrence in iconography once you start looking for them: https://en.wikipedia.org/wiki/Borromean_rings