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The exabit is a multiple of the unit bit for digital information or computer storage. The prefix exa (symbol E) is defined in the International System of Units (SI) as a multiplier of 1018 (1 quintillion, short scale), and therefore 1 exabit = 1018 bits = 1 000 000 000 000 000 000 bits = 1000 petabits. The exabit has the unit symbol Ebit or Eb.
The pebibit is a multiple of the bit, a unit of digital information storage, prefixed by the standards-based multiplier pebi (symbol Pi), a binary prefix meaning 250. The unit symbol of the pebibit is Pibit. 1 pebibit = 250 bits = 1 125 899 906 842 624 bits = 1024 tebibits.