What is filter with such waveform?

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Recently I am learning filters, I have browsed a lot of articles about filters on the Internet, like Principle and Function of the Filter, which are talking about the definition of filters, the functions of filters, and so on. I learned a lot about filters on the Internet, but I also encountered some problems, like the following question.
It’s my first time to see such kind of waveform. So what is the filter with such waveform?
If you know the answer, could you please share it to me?
Thanks a lot.
 

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