Every aircraft I’ve ever flown as either Pilot in Command or required crewmember, and also every marine navigation system I have used in my life has displayed d

Every aircraft I’ve ever flown as either Pilot in Command or required crewmember, and also every marine navigation system I have used in my life has displayed distance information as nm, Nm, or NM, interchangeably. I have never been confused by this, and I have never seen any other crew be confused. I have not ever seen any version of nmi used, in any variation of capitalization. This includes Boeing flight decks, Airbus flight decks, general aviation Garmin equipment, and a few MIL aircraft. And some boats.