Pranava or AUM is an important hymn discussed by most of the Indian philosophical schools. While other schools describe this as either a symbol of God or a path of self realisation, Tantra Sastra interprets Pranava as 'sabdabrahman'. It elaborates from the state of sound formation to self realization. Even though there were earlier studies dealt with this particular subject, this study focuses on how these interpretations differ in its own way. It elaborates on how 'pranava mantra' stabilize a positive energy in this contemporary life situations. Contents: Preface 1. Introduction 2. Concept of Pranava in The Upanisads 3. Concept of Pranava in The Yoga Philosophy 4. Concept of Pranava in The Bhagavad Gita 5. Concept of Pranava in The Tantrasastra 6. Concept of Pranava in other Systems of Indian Philosophy 7. Conclusion Appendix Bibliography Index