Harihara
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Term used to denote the unity of Vishnu and Shiva as one and the same. Hari being the name of Vishnu and Hara that of Shiva. This is a popular concept, especially among those trying to bridge the gaps between Shaivism and Vaishnavism. There is scriptural support for those assertions as both the Shri Rudram and Vishnu sahasranama indicate that Vishnu and Shiva are one.
Secondly, Harihara was the name of the founding ruler of the Vijaynagar empire.
pl:Harihara