Cycle per second
（重定向自Kilocycle）
The cycle per second was a once-common English name for the unit of frequency now known as the hertz. The plural form was typically used, often written "cycles per second", "cycles/second", "c.p.s", "c/s", "~" or just "cycles". The term comes from the fact that sound waves have a frequency measurable in their number of vibrations, or cycles, per second.