A sign/abbreviation for "magister"

[James Kass via Unicode]

Janusz S. Bień asked,

 > Do you claim that in the ground-truth for HWR the
 > squiggle and raising doesn't matter?

Not me!  "McCoy", "M=ͨCoy", and "M-ͨCoy" are three different ways of 
writing the same surname.  If I were entering plain text data from an 
old post card, I'd try to keep the data as close to the source as 
possible.  Because that would be my purpose.  Others might have 
different purposes.  As you state, it depends on the intention. But, if 
there were an existing plain text convention I'd be inclined to use it.  
Conventions allow for the possibility of interchange, direct encoding 
would ensure it.