M

M is a unit in chemistry called molarity.  Molarity means moles of a solute per liter of a solvent.

So 5 liters of a .5 M glucose aqueous (water is the solvent) solution will contain 2.5 moles of glucose molecules.
5 L * .5 M = 2.5 mol

The stock market symbol that the NYSE has reserved for Microsoft in an attempt to seduce it to transfer its stock listing over from the NASDAQ.

Also the Roman numeral for 1000. I'm actually looking forward to seeing movies copyright MM (rather than MCMXCIX) in 1999.

In the James Bond films, the part of M has been played by Bernard Lee, Robert Brown, and (presently) Judi Dench.

Favorite scene: After Lorre buys a child a balloon, Lang shows us the child's mother calling the child for dinner. As her voice echoes among the empty streets, the camera cuts to a view of the balloon, tangled in the power lines.

Trivia: the Red Hot Chili Peppers' video for Otherside seems to be largely inspired by the images in this film, as well as in Metropolis.

"Who knows what it's like to be me?" -M

M is the 13th letter of the alphabet--in English anyway.

In the IPA and in many languages it represents a bilabial voiced nasal.

It is related to, among others, the Greek letter mu and the Hebrew letter mem.

M is the coolest letter of the alphabet, IMHO.

The group had one release which was split 7" with Monade. The song was entitled Vol De Nuit which was rereleased under the Aerial M moniker as a three-song single entitled Vivea.

"M." is an honorific applied to people in the Hyperion series of novels by Dan Simmons.

This title replaced "Mr." "Miss" "Ms." and "Mrs." (probably "Madame", "Monsieur" "Mademoiselle" and "Master", too), and I found it strangely pleasing to both the eye and ear. It added greatly to my sense of immersion in the books.

Examples: "M. Gladstone", "M. Weintraub", etc.

M pref. (on units) suff. (on numbers)

[SI] See quantifier.

--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.

M (em).

1. 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.

The letter M came into English from the Greek, through the Latin, the form of the Greek letter being further derived from the Phœnician, and ultimately, it is believed, from the Egyptian. Etymologically M is related to n, in lime, linden; emmet, ant; also to b.

M is readily followed by b and p. the position of the lips in the formation of both letters being the same. The relation of b and m is the same as that of d and t to n. and that of g and k to ng.

2. As a numeral, M stands for one thousand, both in English and Latin.

© Webster 1913.

M, n.

1. (Print.) 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. [Written also em.]

2. (law) A brand or stigma, having the shape of an M, formerly impressed on one convicted of manslaughter and admitted to the benefit of clergy.

© Webster 1913.