Achieving independency from ego, time and death. The three coils of the snake symbolize the past, present and future – time in cycles. The snake named Vasuki naga is a deadly cobra. The Lord wearing the deadly snake like an ornament signifies that He is independent of time and death. The snake looking in the right direction of Shiva signifies that the Lord’s perpetual laws of reason and justice preserve natural order in the universe. Shiva’s center is supposed to be vishuddhi and he is Vishakantha -as he filters all the poison. He does not allow it to enter his system. Poisons are not necessarily that which you may consume through food. Poisons can enter you in so many ways: a wrong thought, a wrong emotion, a wrong idea, a wrong energy or a wrong impulse can poison your life. If your vishuddhi is active, it filters everything.
The Bull: What it symbolizes? Eternal companion and power of wisdom. The bull who is meditating in front of Shiva is a constant follower of Shiva and a great devotee of Lord Shiva. The bull is a symbol both of power and ignorance which suggests that Lord Shiva removes ignorance of his devotees and gives them the power of wisdom. The Nandi bull beside Lord Shiva indicates that He is the eternal companion of righteousness. Lord Shiva′s use of the bull (Vrisha – righteousness) as his vehicle expresses the idea Lord Shiva takes us to path that leads to wisdom and knowledge.