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A petahertz is a SI prefixes applied unit of frequency, symbol PHz, is a multiple of the of SI prefixes (peta) used with the hertz.
The radian per second (symbol: rad·s−1 or rad/s) is the SI unit of rotational speed (angular velocity), commonly denoted by the Greek letter ω (omega). The radian per second is also the unit of angular frequency. The radian per second is defined as the change in the orientation of an object, in radians, every second.