In Non-Dual Shaivism, also known as Kashmir Shaivism, the concept of Shiva holds great significance as it is considered the ultimate reality, the source of everything that exists. Shiva is not just a deity or a figure, but rather the embodiment of pure consciousness, the supreme consciousness that pervades all beings and the entire universe.

According to Non-Dual Shaivism, everything in the universe is a manifestation of Shiva's infinite and dynamic energy, known as Shakti. This energy is constantly in motion, creating and sustaining the universe, while Shiva remains the unchanging and eternal witness to it all. This concept of Shiva as the ultimate reality is known as "Shiva-tattva" and is the central tenet of Non-Dual Shaivism.

The significance of Shiva in Non-Dual Shaivism lies in the understanding that everything in the universe is a reflection of Shiva's consciousness. This means that every individual has the potential to realize their true nature as Shiva, and that all beings are inherently connected through this universal consciousness. This realization leads to the understanding that there is no separation between the individual and the ultimate reality, and that everything is a manifestation of the same divine consciousness.

Shiva is also seen as the embodiment of pure bliss and joy, and the ultimate goal of Non-Dual Shaivism is to attain a state of oneness with Shiva, known as "Shivatva". This is achieved through various spiritual practices such as meditation, self-inquiry, and devotion, which help individuals to transcend their limited sense of self and merge with the infinite consciousness of Shiva.

Furthermore, Shiva is also revered as the destroyer of ignorance and the liberator of souls. In Non-Dual Shaivism, ignorance is seen as the root cause of suffering and the main obstacle to realizing one's true nature as Shiva. Through the grace of Shiva, one can overcome ignorance and attain liberation from the cycle of birth and death.

In conclusion, the concept of Shiva in Non-Dual Shaivism is of utmost importance as it represents the ultimate reality, the source of all that exists. Shiva is not just a deity to be worshipped, but rather a symbol of the universal consciousness that pervades everything. By understanding and realizing the true nature of Shiva, one can attain liberation and experience the bliss of oneness with the ultimate reality.