counter
counter for waves (of a repeated occurrence)
Used to count distinct waves or surges of something that comes in repeated, often sequential, occurrences, such as sound waves, radio waves, or figurative waves of emotion or activity.
その地震は数波の大きな揺れをもたらした。
The earthquake brought several waves of strong shaking.
新製品の発表に合わせて、広告を三波に分けて打った。
We ran the advertisements in three waves to coincide with the new product launch.