- As a numeral, M stands for one thousand, both in English and
Latin. - A quadrat, the face or top of which is a perfect square; also,
the size of such a square in any given size of type, used as the unit
of measurement for that type: 500 m's of pica would be a piece of
matter whose length and breadth in pica m's multiplied together produce
- A brand or stigma, having the shape of an M, formerly impressed
on one convicted of manslaughter and admitted to the benefit of clergy.