Multiple/Submultiple Prefixes

Factor	Prefix	Symbol
1018	Exa	E
1015	Peta	P
1012	Tera	T
109	Giga	G
106	Mega	M
103	Kilo	k
102	Hecto	h
10	Deca	da
10-1	Deci	d
10-2	Centi	c
10-3	Milli	m
10-6	Micro	µ
10-9	Nano	n
10-12	Pico	p
10-15	Femto	f
10-18	atto	a

Note: care should be exercised in use of the terms “billion”, “trillion”, and “quadrillion”. As time goes by the US meaning of these term is used more widely in UK and Europe.

106 - US, UK and Europe million

109 – US billion, UK milliard

1012 – US trillion, UK and Europe billion

1015 – US quadrillion

1018 – UK and Europe trillion

1024 – UK and Europe Quadrillion

Only one multiplying prefix is applied at one time to a given unit e.g. meganewton (MN), kilojoule (kJ) etc. Compound prefixes are not used.

#GWC Coal Handbook

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