The symbol for the meter. A metric unit of length.
mega
Symbol: M
A metric prefix equivalent to 106 (1 000 000)
megagram
Symbol: Mg
A metric unit of mass equivalent to 106 (1 000 000) grams.
megaliter
Symbol: Ml
Alternate symbols: ML
A metric unit of volume equivalent to 106 (1 000 000) liters.
megameter
Symbol: Mm
A metric unit of length equivalent to 106 (1 000 000) meters.
meter
Symbol: m
The base unit of length for the metric system and the International System of Units (SI). Defined as the exact distance light travels in an absolute vacuum in 1/299 792 458 of a second.
Originally, in 1791, the meter was defined as 1/10 000 000 of the distance between the equater and the North Pole through Paris. Then in 1889 and lasting until 1960 the meter was defined as the exact length of a metal bar kept under certain conditions. In 1960 the definition changed again to be 1 650 763.73 wavelengths of the orange-red emission line in the electromagnetic spectrum of the krypton-86 atom in a vacuum. Then finally in 1983 the definition changed to what we use today.
Of course many scientists are not completely happy, and the definition may change yet again, possibly to 1 579 800.298 728 ± 0.000 039 wavelengths of Helium-Neon laser light in a vacuum, as that is the current delineated value.
metr
Symbol: m
An alternate spelling for the meter. Common in languages such as Czech, Polish, Russian, and Ukranian.
metras
Symbol: m
The Lithuanian spelling for the meter.
metre
Symbol: m
A common French spelling for the meter. Common in Britain, Australia, Canada, New Zealand, and France.
metri
Symbol: m
The Finnish spelling for the meter.
metro
Symbol: m
An alternate spelling for the meter. Common in languages such as Basque, Italian, Portuguese, and Spanish.
Mg
The symbol for the megagram, a metric unit of mass equal to 1 000 000 grams.
mg
The symbol for the milligram, a metric unit of mass equal to 0.001 grams.
micro
Symbol: µ
Alternate symbols: u
A metric prefix equivalent to 10-6 (0.000 001)
microgram
Symbol: µg
Alternate symbols: ug
A metric unit of mass equivalent to 10-6 (0.000 001) grams.
microliter
Symbol: µl
Alternate symbols: µL, ul, uL
A metric unit of volume equivalent to 10-6 (0.000 001) liters.
micrometer
Symbol: µm
Alternate symbols: um
A metric unit of length equivalent to 10-6 (0.000 001) meters.
milli
Symbol: m
A metric prefix equivalent to 0.001
milligram
Symbol: mg
A metric unit of mass equivalent to 0.001 grams.
milliliter
Symbol: ml
Alternate symbols: mL
A metric unit of volume equivalent to 0.001 liters.
millimeter
Symbol: mm
A metric unit of length equivalent to 0.001 meters.
Ml
Alternate symbols: ML
The symbol for the megaliter, a metric unit of volume equal to 1 000 000 liters.
ml
Alternate symbols: mL
The symbol for the milliliter, a metric unit of volume equal to 0.001 liters.
Mm
The symbol for the megameter, a metric unit of length equal to 1 000 000 meters.
mm
The symbol for the millimeter, a metric unit of length equal to 0.001 meters.
