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In communications, electronics, and physics, multipliers are defined in powers of 10 from 10^-24 to 10²⁴, proceeding in increments of three orders of magnitude (10³ or 1,000). In IT and data storage, multipliers are defined in powers of 2 from 2¹⁰ to 2⁸⁰, proceeding in increments of ten orders of magnitude (2¹⁰ or 1,024). These multipliers are denoted in the following table.

Prefix	Symbol(s)	Power of 10	Power of 2
yocto-	y	10-24 *	--
zepto-	z	10-21 *	--
atto-	a	10-18 *	--
femto-	f	10-15 *	--
pico-	p	10-12 *	--
nano-	n	10-9 *	--
micro-	m	10-6 *	--
milli-	m	10-3 *	--
centi-	c	10-2 *	--
deci-	d	10-1 *	--
(none)	--	100	20
deka-	D	101 *	--
hecto-	h	102 *	--
kilo-	k or K **	103	210
mega-	M	106	220
giga-	G	109	230
tera-	T	1012	240
peta-	P	1015	250
exa-	E	1018 *	260
zetta-	Z	1021 *	270
yotta-	Y	1024 *	280
* Not generally used to express data speed
** k = 103 and K = 210

Examples of quantities or phenomena in which power-of-10 prefix multipliers apply include frequency (including computer clock speeds), physical mass, power, energy, electrical voltage, and electrical current. Power-of-10 multipiers are also used to define binary data speeds. Thus, for example, 1 kbps (one kilobit per second) is equal to 10³, or 1,000, bps (bits per second); 1 Mbps (one megabit per second) is equal to 10⁶, or 1,000,000, bps. (The lowercase k is the technically correct symbol for kilo- when it represents 10³, although the uppercase K is often used instead.)

When binary data is stored in memory or fixed media such as a hard drive, diskette, ZIP disk, tape, or CD-ROM, power-of-2 multipliers are used. Technically, the uppercase K should be used for kilo- when it represents 2¹⁰. Therefore 1 KB (one kilobyte) is 2¹⁰, or 1,024, bytes; 1 MB (one megabyte) is 2²⁰, or 1,048,576 bytes.