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SI brochure, section 3.1

The 11th CGPM (1960, Resolution 12) adopted a series of prefixes and prefix symbols to form the names and symbols of the decimal multiples and submultiples of SI units ranging from 1012 to 10–12. Prefixes for 10–15 and 10–18 were added by the 12th CGPM (1964, Resolution 8), for 1015 and 1018 by the 15th CGPM (1975, Resolution 10), and for 1021, 1024, 10–21 and 10–24 by the 19th CGPM (1991, Resolution 4). Table 5 lists all approved prefixes and symbols.

These SI prefixes refer strictly to powers of 10. They should not be used to indicate powers of 2 (for example, one kilobit represents 1000 bits and not 1024 bits).
Table 5. SI prefixes

Factor Name Symbol
Factor Name Symbol

1024 yotta Y
1021 zetta Z
1018 exa E
1015 peta P
1012 tera T
109 giga G
106 mega M
103 kilo k
102 hecto h
101 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
10–21 zepto z
10–24 yocto y

Kibi ???

Pois é… desconhecia, mas o Herlander encontrou isto. Como achei interessante aqui fica. Para o comum mortal não me parece ter muita importãncia, mas achei deveres interessante, especialmente para as áreas de engenharias.

Prefixes for binary multiples
In December 1998 the International Electrotechnical Commission (IEC), the leading international organization for worldwide standardization in electrotechnology, 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. The prefixes are as follows:

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Prefixes for binary multiples
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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

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Examples and comparisons with SI prefixes
one kibibit 1 Kibit = 210 bit = 1024 bit
one kilobit 1 kbit = 103 bit = 1000 bit
one mebibyte 1 MiB = 220 B = 1 048 576 B
one megabyte 1 MB = 106 B = 1 000 000 B
one gibibyte 1 GiB = 230 B = 1 073 741 824 B
one gigabyte 1 GB = 109 B = 1 000 000 000 B

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