no. 12 key patterns
Not only the plaited bands, but also the so called "key patterns" are characteristic for the Celtic art of the early Middle Ages. These key patterns consist also of bands going around triangles, squares and rectangles, but the bends are sharp and they are not going under and over each other. Although they looks very simple, even making copies isn't easy at all. I think mainly because the motifs are not only mirrored, but also translated. The patterns gives borders with have there own character and are really different from all other embroidered borders
Below some examples. You can embroider them in cross stitch and double running stitch
You can find more key patterns on this site.