Nirguna Brahman

Nirguna Brahman, (Devanagari निर्गुण ब्रह्म, nirguṇa brahman, the supreme reality without form, quality, attribute) signifies in Hindu philosophy the Brahman that pervades the Universe, considered without form (guna), as in the Advaita school or else as without material form, as in Dvaita schools of philosophy.

Read more about Nirguna Brahman:  Advaita