Causal Body
Causal Body — this body is, from the standpoint of the physical plane, no body, either subjective or objective. It is, nevertheless, the centre of the egoic consciousness, and is formed of the conjunction of buddhi and manas. It is relatively permanent and lasts throughout the long cycle of incarnations, and is only dissipated after the fourth initiation, when the need for further rebirth on the part of a human being no longer exists.
(Alice A. Bailey "Initiation, Human and Solar")