A sign/abbreviation for "magister"

[Julian Bradfield via Unicode]

On 2018-11-02, James Kass via Unicode <unicode at unicode.org> wrote:
> Alphabetic script users write things the way they are spelled and spell 
> things the way they are written.  The abbreviation in question as 
> written consists of three recognizable symbols.  An "M", a superscript 
> "r", and an equal sign (= two lines).  It can be printed, handwritten, 

That's not true. The squiggle under the r is a squiggle - it is a
matter of interpretation (on which there was some discussion a hundred
messages up-thread or so :) whether it was intended to be = .
Just as it is a matter of interpretation whether the superscript and
squiggle were deeply meaningful to the writer, or whether they were
just a stylistic flourish for Mr.

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