Glossary of Terms
Below is a list of the most commonly used units of measure (according to the Imperial system and International System of Units) with their corresponding symbols. They are followed by a table of multiples and submultiples of the decimal system.
A 


ampere  A 
amperehour  Ah 
ampereturn  Atr 
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B 

bar  bar 
British thermal unit  Btu 
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C 

calorie  cal 
candela  cd 
centimetre  cm 
square centimetre  cm^{2} 
cubic centimetre  cm^{3} 
centimetre per second  cm/s 
circular mil  CM 
one thousand circular mils  MCM 
coulomb  C 
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D 

decibel  dB 
decilitre  dl 
decimetre  dm 
degree Celsius  ^{o}C 
degree Fahrenheit  ^{o}F 
dyne  dyn 
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E 

electronvolt  eV 
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F 

farad  F 
foot  ft 
foot per minute  ft/min 
foot per second  ft/s 
cubic foot  ft^{3} 
cubic foot per minute  ft^{3}/min 
cubic foot per second  ft^{3}/s 
square foot  ft^{2} 
footcandle (see lumens per square foot)  fc 
footpound  ftlb 
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G 

gallon  gal 
Imperial gallon  UK gal 
United States gallon  US gal 
gigahertz  GHz 
gigajoule  GJ 
gigawatt  GW 
gram  g 
gram per square centimetre  g/cm^{2} 
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H 

hertz  Hz 
horsepower  hp 
metric horsepower  
hour  h 
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I 

inch  in 
cubic inch  in^{3} 
square inch  in^{2} 
inchpound  inlb 
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J 

joule  J 
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K 

kelvin  K 
kilogram  kg 
kilogram per centimetre  kg/cm 
kilohertz  kHz 
kilojoule  kJ 
kilolitre  kl 
kilometre  km 
kilometre per hour  km/h 
kilopascal  kPa 
kilopound  klb 
kilopound per square inch  klb/in^{2} 
kilopoundinch  klbin 
kilovar  kvar 
kilovolt  kV 
kilovoltampere  kVA 
kilowatt  kW 
kilowatthour  kWh 
L 

litre  l 
litre per minute  l/min 
litre per second  l/s 
lumen  lm 
lumen per square foot  lm/ft^{2} 
lux  lx 
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M 

megahertz  MHz 
megajoule  MJ 
megavar  Mvar 
megawatt  MW 
megohm  MΩ 
metre  m 
cubic metre  m^{3} 
square metre  m^{2} 
metre per minute  m/min 
metre per second  m/s 
metric horsepower  
microampere  µA 
micrometre (micron)  µm 
mil  mil 
circular mil  CM 
thousands circular mill  MCM 
mile  mi 
square mille  mi^{2} 
mile per hour  mi/h 
mill  mill 
milliampere  mA 
milligram  mg 
millilitre  ml 
millimetre  mm 
cubic millimetre  mm^{3} 
square millimetre  mm^{2} 
minute (angle)  ' 
minute (time)  min 
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N 

newton  N 
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O 

ohm  Ω 
ounce  oz 
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P 

pascal  Pa 
pint  
pound  lb 
pound per square foot  lb/ft^{2} 
pound per cubic foot  lb/ft^{3} 
pound per square inch  lb/in^{2} 
poundfoot (see footpound)  
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R 

radian  rad 
radian per second  rad/s 
revolutions per minute  RPM 
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S 

second (angle)  " 
seconde (time)  s 
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T 

terawatt  TW 
metric ton  MT 
short ton  ST 
statute ton  
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U 

British thermal unit  BTU 
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V 

var  var 
volt  V 
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W 

watt  W 
watthour  Wh 
week  wk 
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Y 

yard  yd 
cubic yard  yd^{3} 
square yard  yd^{2} 
The prefixes below are used to express the multiples commonly used—kilowatthours (kWh), megawatts (MW), kilovolts (kV), etc.—when we talk about the generation, transmission, distribution or consumption of electricity:
Prefix  Symbol  

10 = 10^{1}  deca  da 
100 = 10^{2}  hecto  h 
1,000 = 10^{3}  kilo  k 
1,000,000 = 10^{6}  mega  M 
1,000,000,000 = 10^{9}  giga  G 
1,000,000,000,000 = 10^{12}  tera  T 
1,000,000,000,000,000 = 10^{15}  peta  P 
1,000,000,000,000,000,000 = 10^{18}  exa  E 
0.1 = 10^{1}  deci  d 
0.01 = 10^{2}  centi  c 
0.001 = 10^{3}  milli  m 
0.000 001 = 10^{6}  micro  µ 
0.000 000 001 = 10^{9}  nano  n 
0.000 000 000 001 = 10^{12}  pico  p 
0.000 000 000 000 001 = 10^{15}  femto  f 
0.000 000 000 000 000 001 = 10^{18}  atto  a 
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