jñāna-sattva 

(Sanskrit). ‘Awareness-being’, a term used in later tantric Buddhism to denote the true form of a deity (devatā) as an aspect of enlightenment (bodhi). The awareness being was often summoned to merge with the samaya-sattva, or visualized image of the deity, as a part of the process of worship (pūjā) or self-transformation.

A Dictionary of Buddhism, Oxford University Press, 2003, 2004 (which is available in electronic version from answer.com)