Definition of revolutions per minute unit: = Hz/60. The number of cycles that occurred in one minute. Cycle may be periodically repeating event. Symbol is rpm (revolutions per minute), it is the sixtieth part of Hertz.
Definition of degrees per second unit: = 1/360 Hz. Degrees per second is a variant of the angular velocity unit. One hertz frequency is equal to turning a full circle (360°) in one second , 1 Hz = 360 deg / s.