The shankha is a conch shell, blown by forcing breath through a hole cut at its apex, producing a single sustained note that carries a long way. It opens rituals, marks the beginning and end of aarti, is sounded at temple thresholds, and is one of the four objects Vishnu holds. In the Mahabharata each major warrior has a named conch, and the war begins with the sounding of them, which the text describes as tearing the hearts of the opposing side.
The sound is the reason for all of it. The note produced is unbroken and closely associated with the sound of Om, and the tradition treats it as an audible approximation of the vibration from which manifestation proceeds. Sounding a conch at the start of anything therefore repeats, at human scale, the way the cosmos is said to have started, which is a considerably larger claim than announcement or crowd-gathering. This is the position developed at length under Shabda Brahman, where sound is not a description of reality but its substance.
The object carries its own symbolism alongside the sound. It comes from water, associated with the origin of life; its spiral is right-turning in the rare and highly valued dakshinavarti variety, echoing the direction of cosmic movement; and a shell is what remains when the animal that formed it is gone, a made thing outlasting its maker. Practically, blowing one properly requires sustained breath control, which is why it was traditionally treated as strengthening for the lungs.
The conch is the tradition beginning things by imitating the beginning of everything. To see how sound is treated as the ground of reality, explore more of The Living Sanatan Timeline.
Part 73 of 100 — Series II: To the Eternal
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