Lord Shiva represents the aspect of the Supreme Being (Brahman of the Upanishads) that continuously dissolves to recreate in the cyclic process of creation, preservation, dissolution and recreation of the universe. As stated earlier, Lord Shiva is the third member of the Hindu Trinity, the other two being Lord Brahma and Lord Vishnu.
Owing to His cosmic activity of dissolution and recreation, the words destroyer and destruction have been erroneously associated with Lord Shiva. This difficulty arises when people fail to grasp the true significance of His cosmic role. The creation sustains itself by a delicate balance between the opposing forces of good and evil. When this balance is disturbed and sustenance of life becomes impossible, Lord Shiva dissolves the universe for creation of the next cycle so that the unliberated souls will have another opportunity to liberate themselves from bondage with the physical world. Thus, Lord Shiva protects the souls from pain and suffering that would be caused by a dysfunctional universe. In analogous cyclic processes, winter is essential for spring to appear and the night is necessary for the morning to follow. To further illustrate, a goldsmith does not destroy gold when he melts old irreparable golden jewelry to create beautiful new ornaments.
Lord Shiva is the Lord of mercy and compassion. He protects devotees from evil forces such as lust, greed, and anger. He grants boons, bestows grace and awakens wisdom in His devotees. The symbolism discussed below includes major symbols that are common to all pictures and images of Shiva venerated by Hindus. Since the tasks of Lord Shiva are numerous, He cannot be symbolized in one form. For this reason the images of Shiva vary significantly in their symbolism.
Ganga, symbolically represented on the head of the Lord by a female (Mother Ganga) with a jet of water emanating from her mouth and falling on the ground, signifies that the Lord destroys sin, removes ignorance, and bestows knowledge, purity and peace on the devotees.
Lord Shiva, also called Tryambaka Deva (literally, "three-eyed Lord"), is depicted as having three eyes: the sun is His right eye, the moon the left eye and fire the third eye. The two eyes on the right and left indicate His activity in the physical world. The third eye in the center of the forehead symbolizes spiritual knowledge and power, and is thus called the eye of wisdom or knowledge. Like fire, the powerful gaze of Shiva's third eye annihilates evil, and thus the evil-doers fear his third eye.
A snake (Vasuki Naga) is shown curled three times around the neck of the Lord and is looking towards His right side. The three coils of the snake symbolize the past, present and future - time in cycles. The Lord wearing the curled snake like an ornament signifies that creation proceeds in cycles and is time dependent, but the Lord Himself transcends time. The right side of the body symbolizes the human activities based upon knowledge, reason and logic. The snake looking towards the right side of the Lord signifies that the Lord's eternal laws of reason and justice preserve natural order in the universe.