'Interfingering' in geology refers to a marbleized mixing of two types of layered rock material, where the visible distinctions partially merge into each other in well defined wedge shapes. I like to use the term to include the geographical meshing of hills where erosion has caused a zigzagging pattern. Perhaps it should be called inter-knuckling. It appears to be locked together like a large scale zipper. There is a very human element to the way the land 'meshes'.
This kind of connectivity is pleasing to look at. When stones are fitted together meshing like this it maximizes the strength of a dry stone wall too, in much the same way dovetailing works on the corners of a log house and in the wooden drawer joints in wood cabinetry.