Description
Internally H3 uses an IJK hex coordinate system, where each hex coordinate has a k-component. So it seems confusing to me to use "k-ring" to refer to an unrelated concept. Have you considered changing to a different label for that concept?
I have mostly dealt with the similar concept of the ring of hexagons at exactly the same metric distance from a central cell. I used to call this an "r-ring", for "radius". But r is too convenient for grid resolution, so I switched to "d-ring", for distance. Lately I've been moving towards referring to grid precision, rather than resolution, as I think that more precisely expresses the situation from the standpoint of the data structure. Then p for "precision" leaves r available for "r-ring". But alas I was still on the fence on resolution/precision when I worked on H3, so I used resolution in naming. But I offer up those alternatives for k-ring; I'd synchronize my terminology with H3 going forward if you chose something other than k-ring.