In Hinduism, it is the soul.
Brahma is the name for the principle which creates all of the manifest realms.
Brahma is a metaphor for all of creation: its laws, its inherent intelligence, and its consciously manifested potencies which operate as sages, saints, Rishis, Devas, celestials, and divine beings of all kinds of nature, temperament and description.
Brahma creates, operates in the form of this universe for trillions of years, then dissolves back into Narayana. Later, another Brahma appears to begin the process again.
Atma - Soul