Shiva is one of the Trimurti, or Trinity of the Supreme God, in Hinduism. Shiva’s role in the Trimurti is destruction in order to recreate. He is a source of both good and evil, but his destruction is viewed as constructive for change.
He is most often pictured in simple animal skin, with a third eye(representing wisdom and insight), a trident(representing the Trimurti) and cobra(representing destruction and creation) and three lines drawn horizontally on his forehead(representing power and wealth).
He is also represented by the Shiva Linga, a phallic statue representing his raw power and masculinity.
His consort is Parvati and she balances him out. Their relationship represents equality. They are sometimes depicted together, half man, half woman.