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I can't find any dedicated definition for Frequency F0 counters. Can anyone tell me what does F0 exactly mean, I am confused about that.

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    $\begingroup$ $f_0$ is the fundamental frequency of a signal. $\endgroup$ – jojek May 29 '18 at 12:57
  • $\begingroup$ These are just two random symbols thrown together. I'd also say, it's most like just an unusually-noted fundamental frequency $f_0$, but that's just pure guesswork. Tarun, we'll need you to supply some reference / context. $\endgroup$ – Marcus Müller 16 hours ago
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Hello check this source

To begin with, let’s remember what the fundamental frequency is and in what tasks it may be needed. The fundamental frequency, which is also referred to as F0, is the vibration frequency of the ligaments when pronouncing voiced sounds. When pronouncing unvoiced sounds, for example, by whispering or uttering hissing and whistling sounds, the ligaments do not vibrate, which means that this characteristic is not relevant. *Note that the split on voiced/unvoiced sounds is not equivalent to the split on vowels and consonants.

The variability of the fundamental frequency is quite large, and it can vary greatly not only between people (for lower average male voices the frequency is 70–200 Hz, and for women it can reach 400 Hz), but also for one person, especially in emotional speech.

F0 is used in a wide range of solutions:

Emotion Recognition
Sex determination (male/female voices)
Speaker deterioration, or splitting the speech into phrases
In healthcare, detection of the pathological characteristics of the voice (for example, using the acoustic parameters of Jitter and

Shimmer): F0 could be used for the detection of signs of Parkinson’s disease 1; Jitter and Shimmer can also be used for Emotion Recognition

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    $\begingroup$ It's not very usual to refer to a single frequency $f_0$ in bold, capital notation – that typically indicates something like vector-valuedness, randomness or being a matrix, depending on the context. $\endgroup$ – Marcus Müller 16 hours ago

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