Dakshinavarti Shankh, Valampuri Sanggu; Tamil: வலம்புரி சங்கு or Sri Lakshmi Shankh, is a sacred Hindu object otherwise known in English as a conch shell. This is the shell of a large sea snail from the Indian Ocean (a shell of the species Turbinella pyrum), but one that has the very rare reverse-turning spiral.
In other words, when it is held with the spout (siphonal canal) pointed up, this conch's spiral twists rightwards (dakshinavarti) rather than very much more common form, which twists leftwards (vamavarti).
Read more about Dakshinavarti Shankh: True Vs. Fake, Origin, Rarity, Powers Ascribed, Current Value