I have looked around, but found no real answer for this. I generally use Mathematica for thermodynamics and electromechanical equations and for this, to keep a good overview, i got used to defining variables with a subscripted explanation like so:
Subscript[Z,motor] := Quantity[60, "Ohms"]
Mathematica will mess this notation form up when used in calculations.
I would still prefer to do my definitions this way, but have come to realize that it may well be to impractical in Mathematica?