Prefix Symbols and Names

Prefixes are added to unit names to produce multiple and sub-multiples of the original unit. All multiples are integer powers of ten, and above a hundred or below a hundredth all are integer powers of a thousand.
The tables below show the correct format for prefix symbols and names:

Multiples

Prefix name		deca	hecto	kilo	mega	giga	tera	peta	exa	zetta	yotta
Prefix symbol		da	h	k	M	G	T	P	E	Z	Y
Factor	10⁰	10¹	10²	10³	10⁶	10⁹	10¹²	10¹⁵	10¹⁸	10²¹	10²⁴

Fractions

Prefix name		deci	centi	milli	micro	nano	pico	femto	atto	zepto	yocto
Prefix symbol		d	c	m	μ (Greek lowercase letter mu)	n	p	f	a	z	y
Factor	10⁰	10⁻¹	10⁻²	10⁻³	10⁻⁶	10⁻⁹	10⁻¹²	10⁻¹⁵	10⁻¹⁸	10⁻²¹	10⁻²⁴