David J. Perry wrote:
I can confirm the use of m+overline from my family, although I never adopted it myself.The convention of using a horizontal line to mark an abbreviation, often the omission of m or n, goes back to the middle ages (if not earlier) and was often used in early printed books; apparently it has lived on in some handwriting, to judge from your post. ...
Also, umlauts are handwritten as double dots or as double prime or as a single overline etc. The double prime style looks most like a Fraktur 'e', which AFAIK is where the umlaut modifier originates.
I always considered those personal variations, "font styles" if you wish. Now I know that the m+overline was used elsewhere, thanks :-)
markus
