I'm calling this marking Looped/Loops. This is a marking that would only show on fairytales with white markings except appaloosa. Looped causes curved lines to be "erased" from the white marking, revealing the coat underneath. To do this, I just made the white marking a new layer clipped to the coat and then used the eraser set to the Beizer curve stroke tool on the white layer to make these lines.
Loops can be as steep or shallow as the artist wishes, as long as they are not straight lines. Loops will never create perfect circles, they are curves going across either the length/height of the fairytale or their limbs. There should be a minimum of 2 loops on a fairytale with no maximum (besides completely erasing the white marking).
Looped/Loops was shown on a bay tobiano with sage green hair and metal magic.