Why not stick with their current naming conventions rather than trying to come up with something new.

Call it the Axiom RM(x) or Axiom R(x)

You have the M, QS, EP, LFR.. now you will have the RM

Anthem: AVM60, Fosi DAC-Q5
Axiom: ADA1500, LFR1100 Actiive, QS8, EP500, M3, M3comp, M5