https://www.makersmakings.org/aghora-and-ahumkara/

This is a manifestation of Rudra and Rudra on the same time, Rudra manifests from it

This face of Para Shiva which is dealing with southwards is named as Aghora. Aghora implies that which is not horrible or wrathful and thus this denotes the peaceful face of

Sadashiva. This face is of a Neela Varanam or blue shade. Aghora face represents the macro-component of Fire and it's the side of damaging regeneration i.e. the method of

rejuvenation. This face has the sound of Ahum or it holds the Ahum Naad inside itself. Ahum denotes the I’ness of Maker’s Makings in addition to the I’ness which is held by

every animate and inanimate microcosm.