In the yoga school of Hindu philosophy, idam is linked to the idea of shakti-tattva (the second level of reality). Meanwhile, in Hindu texts such as the Bhagavad Gita, idam is used to refer to Brahman, or the Absolute Reality. It also appears in the "Advaita Vedanta" doctrine, where it denotes looking at something from an outside perspective, as an observer rather than a subject.
Regardless of which definition an individual is using, practicing yoga and meditation is a way to reach a better understanding of the higher realities denoted by idam. It is a means of helping the individual step outside of the self and the ego in order to reach a more complete comprehension of reality.