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The gigabit is a multiple of the unit bit for digital information or computer storage. The prefix giga (symbol G) is defined in the International System of Units (SI) as a multiplier of 109 (1 billion, short scale), and therefore 1 gigabit = 109 bits = 1 000 000 000 bits.
The gigabit has the unit symbol Gbit or Gb.
In computing, a nibble (often nybble or nyble to match the spelling of byte) is a four-bit aggregation, or half an octet.