The following local variable names are reserved:-
Name Use
MMbb Bank descriptor vector.
Kbb_x Bank mnemonics.
IDx Identity codes for media, particles, interactions e.t.c.
Where:-
bb is any bank name e.g. MCVX.
x is any alphanumeric string or null.
Also Q and Z should NOT be used as the first or second letter to avoid conflicts with ZEBRA.