Difference Sigma, Gamma and Beta nought?

I know sigma, gamma and beta nought are backscatter coefficient in SAR images but I don’t know about their application and main differences among them.

Could anyone guide me please?

Sincerely,

Have you seen this topic? Terrain flattering, Sigma0, Beta0 and Gamma0

There is also an explanation here: Radiometric & Geometric Correction Workflow

And one by @peter.meadows: Nominal incidence uncorrected sigma nought

Lastly, there is the radar and SAR glossary by ESA: https://earth.esa.int/handbooks/asar/CNTR5-2.html

Please go through these and feel free to continue here if anything remains unclear.

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Thanks for useful links.

Sincerely,