The radian per second (symbol: rad⋅s−1 or rad/s) is the unit of angular velocity in the International System of Units (SI). The radian per second is also the SI unit of angular frequency, commonly denoted by the Greek letter ω (omega). The radian per second is defined as the angular frequency that results in the angular displacement increasing by one radian every second.

Angular speed ω (in radians per second), is greater than frequency ν (in Hz), by a factor of 2π, because 2π rad/s corresponds to 1 Hz.
General information
Unit systemSI
Unit ofangular speed
Angular frequency ${\displaystyle \omega }$Frequency ${\displaystyle \nu =\omega /{2\pi }}$