What is the unit of normalized cutoff frequency of a butterworth filter ! I know it should be in the range of ( 0 and 1) But I need to know the unit please !!

What is the unit of normalized cutoff frequency of a butterworth filter !

I know it should be in the range of ( 0 and 1)
But I need to know the unit please !!8.9 - What is the unit of normalized cutoff frequency of a butterworth filter ! I know it should be in the range of ( 0 and 1) But I need to know the unit please !!
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