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Prefixes for Binary Multiples

Prefixes for Binary Multiples

The International Electrotechnical Commission (IEC) in 1998 approved as an IEC International Standard names and symbols for prefixes for binary multiples for use in the fields of data processing and data transmission.
     

Factor

Name

Symbol

Origin

Derivation

210 

 kibi

Ki

kilobinary: (210)1

kilo: (103)1

220

mebi

Mi

megabinary: (210)2 

mega: (103)2

230

gibi

Gi

gigabinary: (210)3

giga: (103)3

240

tebi

Ti

terabinary: (210)4

tera: (103)4

250

pebi

Pi

petabinary: (210)5

peta: (103)5

260

exbi

Ei

exabinary: (210)6

exa: (103)6


Note: The new prefixes for binary multiples are not part of the International System of Units (SI). However, for ease of understanding and recall, they were derived from the SI prefixes for positive powers of ten. As shown in the table, the name of each new prefix is derived from the name of the corresponding SI prefix by retaining the first two letters of the SI prefix and adding the letters bi.

Source: National Institute of Standards and Technology (NIST)
GLOSSARY
SI
Systeme Internationale d'Unites, the international metric system of units.
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