What makes a Demon a Demon

The first letter in the vin should be "L" which denotes Dart/Demon. Second digit which on my car is "M" denotes the package level. I don't remember exact build numbers but if I remember there were like 10000 total Demons built in 71 and 8800 in 72. I know on the 71 there were like a total of 4800 or 4900 which were 340 cars, the rest were /6 etc. The 5th digit in the vin denotes engine. 340's were "H". The 3rd and 4th digit which on my Demon is 29 denotes 2 door sports hard top. I believe this is what tells you it's a Demon and not a Dart.