Antaḥkaraṇa is the inner organ, the psychological apparatus through which the self appears to know and act. Vedānta divides it into manas, the mind that considers and doubts; buddhi, the intellect that decides; ahaṃkāra, the sense of I; and citta, the store of memory. All are said to be material and lit by the consciousness of the self.
Antaḥkaraṇa
The “inner instrument”: in Vedānta, the mind in its fourfold function of thinking, deciding, remembering and saying “I”.
Also: Antahkarana, inner instrument