A squircle[1] isn't a bad analogy for this, particularly if it's a super ellipse, parametrically you can adjust between circle and square at either limit. The s

A squircle[1] isn't a bad analogy for this, particularly if it's a super ellipse, parametrically you can adjust between circle and square at either limit. The same can be convenient with types too [1] https://en.wikipedia.org/wiki/Squircle https://en.wikipedia.org/wiki/Squircle