On closer inspection, the cloth map does use the double letter runes. Thanks for highlighting that! I guess that is what I get for quick lazy crosschecking with "Vesper", "Minoc" and "Wind". =P The UO map doesn't use the separator dot though but I like it so when I relabel it I'll throw that in too.

The U9 map (which I really like and was some inspiration) seems to use it with less regularity as well when compared to the U7 one, which is why I probably missed it. I'll have to go through the fonts and see where the combination and separator runes are hidden (probably on the punctuation keys I suspect).