#RotationalFrequency, also known as rotational speed or rate of rotation (symbols ν, lowercase Greek nu, and also n), is the frequency of rotation of an object #aroundAnAxis. Its #SIUnit is the #reciprocalSeconds (s−1); other common #unitsOfMeasurement include the #hertz (Hz), #cyclesPerSecond (cps), and #revolutionsPerMinute (rpm). Rotational frequency can be obtained dividing #angularFrequency, ω, by a full #turn (2π #radians): ν=ω/(2π rad).