order of magnitude

In words (long scale)	In words (short scale)	Prefix	Symbol	Decimal	Power of ten	Order of magnitude
quadrillionth	septillionth	yocto-	y	0.000000000000000000000001	10−24	−24
trilliardth	sextillionth	zepto-	z	0.000000000000000000001	10−21	−21
trillionth	quintillionth	atto-	a	0.000000000000000001	10−18	−18
billiardth	quadrillionth	femto-	f	0.000000000000001	10−15	−15
billionth	trillionth	pico-	p	0.000000000001	10−12	−12
milliardth	billionth	nano-	n	0.000000001	10−9	−9
millionth	millionth	micro-	µ	0.000001	10−6	−6
thousandth	thousandth	milli-	m	0.001	10−3	−3
hundredth	hundredth	centi-	c	0.01	10−2	−2
tenth	tenth	deci-	d	0.1	10−1	−1
one	one	-	-	1	100	0
ten	ten	deca-	da	10	101	1
hundred	hundred	hecto-	h	100	102	2
thousand	thousand	kilo-	k	1,000	103	3
million	million	mega-	M	1,000,000	106	6
milliard	billion	giga-	G	1,000,000,000	109	9
billion	trillion	tera-	T	1,000,000,000,000	1012	12
billiard	quadrillion	peta-	P	1,000,000,000,000,000	1015	15
trillion	quintillion	exa-	E	1,000,000,000,000,000,000	1018	18
trilliard	sextillion	zetta-	Z	1,000,000,000,000,000,000,000	1021	21
quadrillion	septillion	yotta-	Y	1,000,000,000,000,000,000,000,000	1024	24