The One who is the all pervading purity.
The One who is the daughter to Rishi Katyayan, in form of BhadraKali.
She is Maa to all life.
She whose love is ever pure for all Her seekers.
Her formlessness depicted as void or being dark is the pure consciousness.
She who also shows that purity is not attained only from love, but also through destruction.
Destruction of ego, ignorance, fear and attachment.
Hence the name, Katyayani.