शंख blown produces the praṇava sound OM. ओमित्येतदक्षरमुद्गीथमुपासीत । ओमिति ह्युद्गायति तस्योपव्याख्यानम् ॥ omiti hyudgāyati tasyopavyākhyānam "One should meditate on this Syllable [Om]."– Chandogya Upanishad 1.1.1 See image of conch as a blower of the sound OM. Complete raw shell Turbinella pyrum harappa (image attached) used as conch blower and as libation vessel. Turbinella pyrum is a signature tune of Sarasvati Civilization.
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