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Lingam

The Linga Purana states, "Shiva is signless, without color, taste, smell, that is beyond word or touch, without quality, motionless and changeless". The source of the universe is the signless, and all of the universe is the manifested Linga, a union of unchanging Principles and the ever changing nature. The Linga Purana and the Shiva Gita texts builds on this foundation. Linga, states Alain Daniélou, means sign. It is an important concept in Hindu texts, wherein Linga is a manifested sign and nature of someone or something. It accompanies the concept of Brahman, which as invisible signless and existent Principle, is formless or linga-less.

The Shvetashvatara Upanishad states one of the three significations, the primary one, of Lingam as " the imperishable Purusha ", the absolute reality, where says the linga as "sign", a mark that provides the existence of Brahman, thus the original meaning as "sign". Furthermore, it says "Shiva, the Supreme Lord, has no liūga", liuga (Sanskrit: लिऊग IAST: liūga) meaning Shiva is transcendent, beyond any characteristic and, specifically the sign of gender.

Apart from anthropomorphic images of Shiva, he is also represented in aniconic form of a lingam. These are depicted in various designs. One common form is the shape of a vertical rounded column in the centre of a lipped, disk-shaped object, the yoni, symbolism for the goddess Shakti. In Shiva temples, the linga is typically present in its sanctum sanctorum and is the focus of votary offerings such as milk, water, flower petals, fruit, fresh leaves, and rice. According to Monier Williams and Yudit Greenberg, linga literally means 'mark, sign or emblem', and also refers to a "mark or sign from which the existence of something else can be reliably inferred". It implies the regenerative divine energy innate in nature, symbolized by Shiva.

Some scholars, such as Wendy Doniger, view linga as merely a phallic symbol, although this interpretation is criticized by others, including Swami Vivekananda, Sivananda Saraswati, Stella Kramrisch, Swami Agehananda Bharati, S. N. Balagangadhara, and others. According to Moriz Winternitz, the linga in the Shiva tradition is "only a symbol of the productive and creative principle of nature as embodied in Shiva", and it has no historical trace in any obscene phallic cult. According to Sivananda Saraswati, westerners who are curiously passionate and have impure understanding or intelligence, incorrectly assume Siva Linga as a phallus or sex organ. Later on, Sivananda Saraswati mentions that, this is not only a serious mistake, but also a grave blunder.

The worship of the lingam originated from the famous hymn in the Atharva-Veda Samhitâ sung in praise of the Yupa-Stambha, the sacrificial post. In that hymn, a description is found of the beginningless and endless Stambha or Skambha, and it is shown that the said Skambha is put in place of the eternal Brahman. Just as the Yajna (sacrificial) fire, its smoke, ashes, and flames, the Soma plant, and the ox that used to carry on its back the wood for the Vedic sacrifice gave place 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 text Linga Purana, the same hymn is expanded in the shape of stories, meant to establish the glory of the great Stambha and the superiority of Shiva as Mahadeva.

The oldest known archaeological linga as an icon of Shiva is the Gudimallam lingam from 3rd-century BCE. In Shaivism pilgrimage tradition, twelve major temples of Shiva are called Jyotirlinga, which means "linga of light", and these are located across India.