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The zettabit is a multiple of the unit bit for digital information or computer storage. The prefix zetta (symbol Z) is defined in the International System of Units (SI) as a multiplier of 1021 (1 sextillion, short scale),[1]and therefore 1 zettabit = 1021 bits = 1 000 000 000 000 000 000 000 bits = 1000 exabits. The zettabit has the unit symbol Zbit or Zb.
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.