The linga or lingam, together with the Yoni, is one of the main objects used in the worship of Shiva. The typical form of the lingam is an ovoid shaped stone, traditionally found in the Narmada river. In the Tantras and the Puranas, the lingam is said to be a phallic symbol representing the regenerative aspect of the material universe, i.e. Shiva’s phallus. The lingam arises out of the base or Yoni which represents Shiva’s Goddess consort.
Worship of the Shiva lingam is typically performed by pouring water, milk, honey, ghee, yogurt and other substances over the lingam, as well as by placing flowers and other offerings upon and around it. Liquid offerings may be recollected in a container placed beneath the spout of the yoni.