Quite, though TTm is a recognised designation for TT 1:120 using 9mm track to represent metre gauge on the Continent, they accept the discrepancy, it's a lot closer for 3ft 6ins/1067mm gauge, though. I have some of the Shapeways bodies for future use as though I like TT scale I didn't like the 6.5mm track I used on my TTe layout, though that is spot on for 750/760mm gauge!
Trying to sort out NG designations would give Andy an even bigger headache than this thread does!! 🤣