Cycle per second

The cycle per second was a once-common unit of frequency. With the organization of the International System of Units (abbreviated SI from the French) in 1960, the cycle per second was officially replaced by the hertz, or reciprocal second—i.e. the cycle in ‘cycle per second’ was dropped. Symbolically, “cycle per second” units are “cycle/second”, while hertz is “1/second” (reciprocal second, without “cycle”) or .