Garbhagriha
Garbhagriha or Garbha gruha (garbha gṛha) (Sanskrit: गर्भगॄह) is the sanctum sanctorum, the innermost sanctum of a Hindu temple where resides the murti (idol or icon) of the primary deity of the temple. Literally the word means "womb chamber", from the Sanskrit words garbha for womb and griha for house. Only 'priests' (pujari) are allowed to enter this chamber.
Although the term is often associated with Hindu temples, it is also found in Jain and Buddhist temples.
Architecture
In temples with a spire or vimana, this chamber is placed directly underneath it, and the two of them form the main vertical axis of the temple. These together may be understood to represent the axis of the world through Mount Meru. The garbha griham is usually also on the main horizontal axis of the temple which generally is an east-west axis. In those temples where there is also a cross-axis, the garbha gṛha is generally at their intersection.
Generally the garbhagriha is a windowless and sparsely lit chamber, intentionally created thus to focus the devotee's mind on the tangible form of the divine within it. Entrance to the garbha grha may be restricted to priests who perform the services there.