Lord Shiva is the third god in the Hindu triumvirate, which consists of three gods responsible for creation, upkeep, and destruction of the world. Vishnu is the maintainer or preserver of the World, Brahma is the creator, and Shiva is the destroyer or transformer.
These three have been called the Great Trinity or Hindu Triad. The concept in Hinduism is one where cosmic functions or creation, maintenance, and destruction are personified.
Shiva is famous for his third eye, which emits flames that destroy evil. According to Hinduism, Shiva opens his third eye only in extreme cases, where there is no more space for forgiveness.
No one knows exactly how many times Shiva opened his third eye. Some of the known instances include when he destroyed Kaama (lust) and when he destroyed Lord Indra’s arrogance.