Spanda is a conceptual term for Kashmir Shaivism Schools of philosophy. This word gained more practical circulation in philosophical circles during the latter half of the 8th century CE. The source of this concept is found in Shiva Sutra from Kashmir, discovered by Siddha Vasugupta (Shaiva Sutra – No. 30 – Siva Sakti praayosya visvam). The words unmesha and sphurat are used a synonyms for this concept. This concept is akin to the Vedanta concept of first desire (sa akamayata in Upanishad) by the unmanifested absolute, which caused the emergence and evolution of this multiple creation. Spanda literally means vibration. The Kashmir School of Shaivism, technically called pratyabhijna darshana, expounds this concept as Spanda Shastra. This word is used to convey the following meanings, depending upon the context – The very nature of the supreme (svabhava) The dharma of shakti The active process of the shakti (vyapara) The play of the shakti (vilasa) The very same essence of the shakt