The lobe, along one axis: how many times it bends
Ordered from an outer edge with no inflection at all to one that changes direction three times, plus the filled extreme. The lobe is shown alone — it is the component under discussion — with the composed mark beside it, since that is where it is actually judged.
today
Today’s lobe has a blunt head and a tail that curls in — about two changes of curvature. Everything below is measured against that.