One thousandth of a meter is a term of measurement. It can be abbreviated by writing .001 m, or in fraction form 1/1000th m.
"monsieur" is abbreviated "m." in French.
The logarithmic unit of measurement "decibel"" is abbreviated as "dB"
Meter is usually abbreviated with "m" , so one meter would be 1 m.
Horsepower
In SI units- the meter (m).
M. monsieur (singular) is abbreviated: m. (no 'r') messieurs (plural) is abbreviated: mm.
Messrs is already the abbreviated form of Messieurs.
The tablespoon is abbreviated tbsp. I believe the average tablespoon holds 25ml of water.
For the same reason Kilogramme is abbreviated to Kg... to save space when writing or typing the measurement.
M refers to the modulus of the slope.
M means medium width, as opposed to wide (abbreviated "W") or narrow (abbreviated "B").