What is the Random Seed Represent?

Dear @obed @lukepolson @Ahmed_Shebl

I want to use SlicerSpectRecon Plug in (GitHub - PyTomography/slicer_spect_recon: 3d slicer extension for pytomography to enable easy reconstruction of SPECT images)

May I know what the Random Seed Represents?

What is the number should i put?

image