Shiva has always been referred to as Triambaka because he has a third eye.

Shiva has always been referred to as Triambaka because he has a third eye. The third eye does not mean someone’s forehead cracked and something came out! It simply means another dimension of perception has opened up. If your perception has to evolve and enhance itself, the most important thing is that your energy has to evolve and enhance itself. The whole process of yoga is to evolve and refine your energies in such a way that your perception is enhanced and the third eye opens. The third eye is the eye of vision. The two physical eyes are just sensory organs. They feed the mind with all kinds of nonsense, because what you see is not the truth. You see this person or that person and you think something about him, but you are not able to see the Shiva in him. You see things the way it is necessary for your survival. Another creature sees it another way, as is necessary for its survival. This is why we say this world is maya. Maya means it is illusory. We are not saying that existence is illusory. We are only saying the way you are perceiving it is illusory. So another eye, an eye of deeper penetration, has to be opened up. The third eye means your perception has gone beyond the dualities of life. You are able to see life just the way it is, not just the way that is necessary for your survival. ~ Sadhguru !
Hari Om Tat Sat ~ Jai Tryambaka Deva!