exa- [EKS uh] +
(Greek: from hexa-, "six"; a decimal prefix used in the international metric system for measurements)
This is a prefix that is used in the metric [decimal] system as one-quintillion [U.S.] or trillionfold [U.K.], 1018 [1 000 000 000 000 000 000]. The metric symbol for exa- is E.
A bit is a unit of measurement of information (from Binary + digIT); the amount of information in a system having two equiprobable states: "There are eight bits in a byte".
2. A unit of information equal to 1 024 pebibytes or 260 bytes.