
 
Orders of magnitude of data 
The petabit is a multiple of the unit bit for digital information or computer storage. The prefix peta (symbol P) is defined in the International System of Units (SI) as a multiplier of 10^{15} (1 quadrillion, short scale),^{[1]} and therefore
The petabit has the unit symbol Pbit or Pb.
The petabit is closely related to the pebibit, a unit multiple derived from the binary prefix pebi of the same order of magnitude,^{[2]} which is equal to 2^{50}bits = 1125899906842624bits, or approximately 13% larger than the petabit.
In October 2022, scientists from Denmark and Sweden reported the first data transmission to exceed 1 Pbit/s using only a single laser and a single optical chip.^{[3]}^{[4]}