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The exabyte is a multiple of the unit byte for digital information. In the International System of Units (SI), the prefix exa indicates multiplication by the sixth power of 1000 (1018). Therefore, one exabyte is one quintillion bytes (short scale). The symbol for the exabyte is EB.
In computing, a nibble (often nybble or nyble to match the spelling of byte) is a four-bit aggregation, or half an octet.