SI prefix meaning 10 to the 18th power (1018 or 10^18). Abbreviation is E.

Note that 'exa' now officially means 1018 even in the context of data processing. The prefixes kilo, mega, giga, tera, peta, exa, zetta, yotta always refer to powers of 10.

To refer to powers of 210 (powers of 1024), use the new binary prefixes kibi, mebi, gibi, tebi, pebi, and exbi. So

1 exabyte = 1 EB = 1018 bytes
1 exbibyte = 1 EiB = 10246 bytes

These new prefixes were created in December 1998 by the International Electrotechnical Commission: see the node prefixes for binary multiples for fuller explanation.

It is permissible to use terms like 'exabyte' to mean exbibyte on a temporary basis until industry standards have shifted to the new terms.

The prefix 'exa' was originally adopted by the fifteenth CGPM of the SI in 1975. It comes from an alteration of the Greek for 'six'.

Evil Empire = E = examining the entrails

exa- /ek's*/ pref.

[SI] See quantifiers.

--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.

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