Exa

Exa (symbol E) is a prefix in the SI system of units denoting 10¹⁸ or 1 000 000 000 000 000 000.

Adopted in 1991, it comes from the Greek ἕξ, meaning six (like hexa-), because it is equal to 1000⁶.

See also

• SI prefix
• Binary prefix

External link

• BIPM website