The lingam (IAST: liṅgaṃ, Hindi: लिंग, linga, ling, Shiva linga, Shiv ling, meaning sign, symbol or mark) is an abstract or aniconic representation of the Hindu deity, Shiva, used for worship in temples, smaller shrines, or as self-manifested natural objects. In traditional Indian society, the linga is seen as a symbol of the energy and potential of Shiva himself.
The lingam is often represented alongside the yoni (Sanskrit word, literally "origin" or "source" ), a symbol of Durga.
The lingam is a column-like or oval (egg-shaped) symbol of Shiva, the Formless All-pervasive Reality, made of stone, metal, or clay. The Shiva Linga is a symbol of Lord Shiva – a mark that reminds of the Omnipotent Lord, which is formless. In Shaivite Hindu temples, the linga is a smooth cylindrical mass symbolising Shiva. It is found at the centre of the temple, often resting in the middle of a rimmed, disc-shaped structure, a representation of Shakti.
Anthropologist Christopher John Fuller wrote that although most sculpted images (murtis) are anthropomorphic, the aniconic Shiva Linga is an important exception. Some believe that linga-worship was a feature of indigenous Indian religion.
There is a hymn in the Atharvaveda that praises a pillar (Sanskrit: stambha), and this is one possible origin of linga worship. Some associate Shiva-Linga with this Yupa-Stambha, the sacrificial post. In the hymn, a description is found of the beginning-less and endless Stambha or Skambha, and it is shown that the said Skambha is put in place of the eternal Brahman. The sacrificial fire of the Yajna, its smoke, ashes and flames, the soma plant, and the ox that used to carry the wood for the Vedic sacrifice, gave rise to the conceptions of the brightness of Shiva's body, his tawny matted hair, his blue throat, and the riding on the bull of the Shiva. The Yupa-Skambha gave place in time to the Shiva-Linga. In the Linga Purana the same hymn is expanded in the shape of stories meant to establish the glory of the great Stambha and the supreme nature of Mahâdeva (the Great God, Shiva).