Details, Fiction and bhairav
Yantra has bhupur which has bandha or locks in 4 corners which happens to be denoted with half sun or moon. Then will come 64 petals circle on which sixty four varieties of Bhairava reside.When brahma and viShNu were being bought into an argument who is the supreme, Lord shiva appeared given that the column of hearth in between them. kAla bhairava