Yantra has bhupur that has bandha or locks in four corners and that is denoted with fifty percent Sunlight or moon. Then will come 64 petals circle on which 64 types of Bhairava reside. In A different Tale, when Sati died, then Shiva was lamenting (रुदन) roaming the three worlds https://deborahv974vbi1.activablog.com/30769719/the-fact-about-bhairav-that-no-one-is-suggesting