How to pronounce m in English

"M the thirteenth letter of the English alphabet is a vocal consonant and from the manner of its formation is called the labio-nasal consonant. See Guide to Pronunciation // 178-180 242."

"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 that number."

"A brand or stigma having the shape of an M formerly impressed on one convicted of manslaughter and admitted to the benefit of clergy."