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In computing, a nibble (often nybble or nyble to match the spelling of byte) is a four-bit aggregation, or half an octet.
The zettabyte is a multiple of the unit byte for digital information. The prefix zetta indicates multiplication by the seventh power of 1000 or 1021 in the International System of Units (SI). A zettabyte is one sextillion (one long scale trilliard) bytes. The unit symbol is ZB.