Unit or Term	Abbreviation		Unit or Term	Abbreviation
alternating current	ac		lumen second	lm · s
American wire gauge	AWG		lux	lx
ampere	A		magnetohydrodynamics	MHD
ampere · hour	Ah		magnetomotive force	MMF
ampere turn	A		medium frequency	MF
amplitude modulation	AM		megaelectronvolt	MeV
antilogarithm	antilog		megahertz	MHZ
audio frequency	AF		megavolt	MV
automatic frequency control	AFC		megawatt	MW
automatic gain control	AGC		megohm	MQ
automatic volume control	AVC		metal-oxide semiconductor	MOS
average	avg		meter	m
baud	Bd		meter-kilogram-second	MKS
beat-frequency oscillator	BFO		microampere	μA
binary coded decimal	BCD		microfarad	μF
bit	b		microgrm	μg
British thermal unit	Btu		microhenry	μH
calorie	cal		micrometer	μm
candela	cd		micromho	μΩ-1
candela per square foot	cd/ft2		microsecond	μs
candela per square meter	cd/m2		microwatt	μW
cathode-ray oscilloscope	CRO		mile (statute)	mi
cathode-ray tube	CRT		mile per hour	mi/h
centimeter	cm		milliampere	mA
circular mil	cmil		milligram	mg
continuous wave	CW		millihenry	mH
coulomb	C		milliliter	ml
cubic centimeter	cm3		millimeter	mm
cubic foot per minute	ft3/min		millisecond	ms
cubic meter	m3		millivolt	mV
cubic meter per second	m3/s		milliwatt	mW
decibel	dB		minute (plane angle)	…′
degree (plane angle)	...°		minute (time)	min
degree (temperature interval or difference)	deg		nanofarad	nF
degree Celsius	°C		nanometer	nm
degree Fahrenheit	°F		nanosecond	ns
degree Rankine	°R		nanowatt	nW
diameter	diam		neper	Np
direct current	dc		newton	N
electromagnetic compatibility	EMC		newton meter	N · m
electromagnetic unit	EMU		newton per square meter	N/m2
electromotive force	EMF		ohm	Ω
electronic data processing	EDP		ounce (avoirdupois)	oz
electronvolt	eV		per unit	pu
electrostatic unit	ESU		phase modulation	PM
extra-high voltage	EHV		picoampere	pA
extremely high frequency	EHF		picofarad	pF
extremely low frequency	ELF		picosecond	ps
farad	F		picowatt	pW
field-effect transistor	FET		pound	lb
foot	ft		pound per square inch	lb/in2
foot per minute	ft/min		poundal	pdl
foot per second	ft/s		pound-force	lbf
foot pound-force	ft-lbf		pound-force foot	lbf · ft
frequency modulation	FM		pound-force per square inch	lbf/in2
gallon	gal		power factor	PF
gallon per minute	gal/min		radian	rad
gauss	G		radio frequency	RF
gigaelectronvolt	GeV		radio-frequency interference	RFI
gigahertz	GHz		resistance-capacitance	RC
gram	g		resistance-inductance-capacitance	RLC
henry	H		revolution per minute	r/min
hertz	Hz		revolution per second	r/s
high voltage	HV		roentgen	R
hour	h		root-mean-square	rms
inch	in		second (plane angle)	...″
inch per second	in/s		second (time)	s
inductance-capacitance	LC		shortwave	SW
inertia	kg · m2 or lb · ft2		Siemens	S
infrared	IR		signal-to-noise ratio	SNR
inside diameter	ID		silicon controlled rectifier	SCR
intermediate frequency	IF		square foot	ft2
joule	J		square inch	in2
joule per degree	J/deg		square meter	m2
kelvin	K		square yard	yd2
kiloelectronvolt	keV		standing-wave ratio	SWR
kilogram	kg		television interference	TVI
kilohertz	kHz		tesla	T
kilohm	kΩ		thousand circular mils	kcmil
kilojoule	kj		transverse electric	TE
kilometer	km		transverse electromagnetic	TEM
kilometer per hour	km/h		transverse magnetic	TM
kilovar	kvar		traveling-wave tube	TWT
kilovolt	kV		vacuum-tube voltmeter	VTVM
kilovoltampere	kVA		var	var
kilowatt	kW		variable-frequency oscillator	VFO
kilowatthour	kWh		very high frequency	VHP
lambert	L		volt	V
liter	L		voltage controlled oscillator	VCO
liter per second	L/s		voltage standing-wave ratio	VSWR
logarithm	log		voltampere	VA
logarithm, natural	ln		watt	W
low frequency	LF		watt per steradian	W/sr
lumen	lm		watt per steradian square meter	W/(sr · m2)
lumen per square foot	lm/ft2		watthour	Wh
lumen per square meter	lm/m2		weber	Wb
lumen per watt	lm/W		yard	yd

Adapted from IEEE Standards, "Recommended Unit Symbols, SI Prefixes, and Abbreviations"