Exabit

A measurement of digital information storage or transmission, and a multiple of the unit "bit" using the International System of Units prefix.

The Exabit is 10^18 bits, or 1,000,000,000,000,000,000 bits or 1000 petabits. An Exabit is equal to 125 petabits.

Exabits have no practical applications as of 2011.

Very similar to exbibits, which use a more exact prefix established by the International Electrotechnical Commission.