What about normal iteration?
I could see some slight confusion here, because "normal" has 2 meanings in general: (1) common and (2) perpendicular. I can't see any reason to use the term "perpendicular tetration", so I don't think we have to worry there. Also, it would be easier to switch from natural to normal since they sound similar too.
I could see some slight confusion here, because "normal" has 2 meanings in general: (1) common and (2) perpendicular. I can't see any reason to use the term "perpendicular tetration", so I don't think we have to worry there. Also, it would be easier to switch from natural to normal since they sound similar too.

