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Chapter 9.
- mG—milligauss
- mg—milligram
- μg—microgram
- Mgal/d—million gallons per day
- mH—millihenry
- μH—microhenry
- MHz—megahertz
- mHz—millihertz
- mi—mile (statute)
- mi 2—square mile
- mi/gal—mile(s) per gallon
- mi/h—mile(s) per hour
- mil—mil
- min—minute (time)
- μin—microinch
- mL—milliliter
- mm—millimeter
- mm 2—square millimeter
- mm 3—cubic millimeter
- μm 2 —square micrometer
- μm 3 —cubic micrometer
- μμ—micromicron (use of compound prefixes obsolete; use pm, picometer)
- μμf—micromicrofarad (use of compound prefixes obsolete; use pF)
- mmHg—conventional millimeter of mercury
- mΩ—megohm
- mo—month
- mol—mole (unit of substance)
- mol wt—molecular weight
- mp—melting point
- ms—millisecond
- μs—microsecond
- Mt—megaton
- mV—millivolt
- μV—microvolt
- MW—megawatt
- mW—milliwatt
- μW—microwatt
- MWd/t—megawatt-days per ton
- Mx—maxwell
- n—nano (prefix, one-billionth)
- N—newton
- nA—nanoampere
- nF—nanofarad
- N·m—newton meter
- N/m 2 —newton per square meter
- nmi—nautical mile
- Np—neper
- ns—nanosecond
- N·s/m 2 —newton second per square meter
- nt—nit
- od—outside diameter
- Oe—oersted (use of A/m, amperes per meter, preferred)
- oz—ounce (avoirdupois)
- p—pico (prefix, one-trillionth)
- P—poise
- Pa—pascal
- pA—picoampere
- pet—percent
- pdl—poundal
- pF—picofarad (micromicrofarad, obsolete)
- pF—water-holding energy
- pH—hydrogen-ion concentration
- ph—phot; phase
- pk—peck
- p/m—parts per million
- ps—picosecond
- psi—pounds per square inch
- pt—pint
- pW—picowatt
- qt—quart
- quad—quadrillion (1015)
- °R—rankine
- °R—roentgen
- R—degree rankine
- R—degree reaumur
- rad—radian
- rd—rad
- rem—roentgen equivalent man
- r/min—revolutions per minute
- rms—root mean square
