Nandi in a zoo-anthropomorphic form
|Affiliation||Mount of Shiva|
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Nandi (Sanskrit: नन्दि, Tamil: நந்தி, Kannada: ನಂದಿ, Telugu: న౦ది, Odia: ନନ୍ଦି) is the name of the gate- guardian deity of Kailasa, the abode of Lord Shiva. He is usually depicted as a bull which also serves as the mount (Sanskrit: Vahana) to the god Shiva. According to Saivite tradition, he is considered as the chief guru of eight disciples of Nandinatha Sampradaya - Sanaka, Sanatana, Sanandana, Sanatkumara, Tirumular, Vyagrapada, Patanjali and Sivayoga Muni who were send to eight directions to spread the wisdom of Shaivism.
The word nandi has come from Tamil root word Nandhu (Tamil: நந்து) means to grow to flourish or to appear which was used to indicate growing fluorished white bulls as well as divine bull nandi. The Sanskrit word nandi (Sanskrit: नन्दि has the meaning of "happy", "joy" and "satisfaction"; also said as the properties of divine guardian of Lord Shiva - Nandi. Almost all Shiva temples display stone images of a seated Nandi, generally facing the main shrine.
However, it is recently documented that the application of the name Nandi to the bull (Sanskrit: vṛṣabha) is infact a development of recent syncretism of different regional beliefs within Saivism. The oldest Saivite texts in Sanskrit, Tamil and other Indian languages, the name Nandi was widely used instead for an anthropomorphic door-keepers of Kailasha rather than his mount.
History and Legends
The worship of Shiva and Nandi can be trace to even Indus Valley Civilization time period. The famous 'Pasupati Seal' depicts a seated figure which is usually identified as Shiva and there were so many bull seals were found in Mohenjo daro and Harappa that led to conclude the researchers it might be the origin of Bull - cum - Nandi worship.
Nandi is described as the son of the sage Shilada. Shilada underwent severe penance to have a boon — a child with immortality towards Lord Shiva and got Nandi as his son. It is said that Nandi was born from a Yajna performed by the Shilada and his body was clad in armour made out of diamonds when he was born. Nandi grew as an ardent devotee of Lord Shiva and he did penance to become the gate-keeper of the Lord Shiva as well as his mount.
Nandi got the divine knowledge of Agamic and Tantric wisdom taught by Lord Shiva from goddess Parvati. He could teach that divine knowledge to his Eight disciples who are identified as the progenitors of Nandinatha Sampradaya - Sanaka, Sanatana, Sanandana, Sanatkumara, Tirumular, Vyagrapada, Patanjali and Sivayoga Muni. These eight disciples are directed to eight directions of the world by Nandinatha to spread the wisdom he taught them.
There are so many other puranic tales are available about nandi. One describes his conflict with Ravana, the anti-hero of Ramayana. Nandi cursed Ravana (the demon King of Lanka) that his kingdom would be burnt by a monkey (Vanara). Later Hanuman burnt Lanka when he went in search of Sita, who was kept prisoner by Ravana in Ashok Vatika.
Tamil Thiruvilaiyadal puranam mentions another story in which nandi [incarnate]] as a whale. It tells that Parvati lost her concentration while Shiva was explaining the meaning of Vedas to her. Parvati incarnated as a fisherwoman for the atone. To unite his master and his beloved wife, Nandi took the form of a whale and started to trouble the people. Fisherwoman Parvati's father told that anyone who killed the whale will marry his daughter. Later Lord Shiva took the form of a fisherman, killed the whale and got Parvati in her previous form.
Iconography and symbolism
Agamas describe him in a zoo-anthropomorphic form with the head of bull and four hands with antelope, axe, mace and abhayamudra. In his mount form, nandi is depicted as a seated bull in all Shiva temples, all over the world. This nandi form has been found even in Southeast Asian countries including Cambodia.
The white color of the bull symbolizes purity and justice.. Symbolically, the seated Nandi towards sanctum in Siva temples, represents an individual [atman|jiva]] (soul) and the message that the jiva should always be focused on the Parameshwara. From the yogic perspective, Nandi is the mind dedicated to Lord Siva, the Absolute. In other words, to understand and absorb Light, the 'experience and the wisdom' is Nandi which is the Guru within.
Nandi Flag, a flag with the emblem of seated bull is recognized as the flag of Saivism, particularly among Tamil community all over the world. Nandi was the emblem of historical Tamil monarches such as Pallava dynasty and Jaffna Kingdom. Several campaigns to aware the Saivites about their Nandi flag is carried out continuously during the Shivaratri session particularly in Sri Lanka, Tamil Nadu and Tamil diaspora.
The nandi flag used nowadays was designed by Mr.Ravindra Sastri of Madurai, Tamil Nadu according to the request and guidance of Mr.S.Danapala, a Sri Lankan Saivite personage in the 1995s. The first Nandi flag was hoisted in 1998 at Colombo Hindu College at Ratmalana, Sri Lanka. Following years, It was declared as the official saivite flag in Fourth international Saiva Siddhanta Conference held at Zurich in 2008  Nowadays Tamil Saivites, especially in Sri Lanka, Canada, Australia, UK, South Africa and Switzerland hoist Nandi Flag in their all religious and cultural festivals. Nandi flag is declared as the official Hindu flag of Sri Lanka. 
- Cattle in religion
- Apis (Egyptian mythology)
- Awal (Bahrain deity)
- Golden calf (Abrahamic mythology)
- Audhumbla (Norse mythology)
- Gavaevodata, the primordial cow in Zoroastrianism
- Hathor, Egyptian cow goddess
- Serapis, Graeco-Egyptian god
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