Company Writer's Guide
[For Illustration Only] B-12
Symbols for Units in General Use (Cont’d)
Unit Symbol Notes
metric ton t
1 t = 1,000 kg. The name tonne is used in some
countries for this unit, but use of this name in the
USA is deprecated (see ANSI Z210.1-1976).
mho mho Formerly used as the name of the siemens (S).
micro
μ
SI prefix for 10
-6
.
microampere μA
microfarad μF
microgram μg
microhenry μH
microinch μin
microliter μL See note for liter.
micrometer μm
micron μm Deprecated. Use micrometer.
microsecond μs
microwatt μW
mil mil 1 mil = 0.001 in.
mile (statute) mi 1 mi = 5280 ft
mile per hour mi/h
Although use of mph as an abbreviation is
common, it should not be used as a symbol.
milli m SI prefix for 10
-3
milliampere mA
millibar mbar
Use of the bar is strongly discouraged in ANSI
Z210.1, except for limited use in meteorology.
milligram mg
millihenry mH
