here is an image of one such stone pair, not exactly what we had at home, but close: https://www.natureloc.com/products/ammikallu-grinding-stone https://www.na

here is an image of one such stone pair, not exactly what we had at home, but close: https://www.natureloc.com/products/ammikallu-grinding-stone https://www.natureloc.com/products/ammikallu-grinding-stone also called aattukallu in tamil and iman dasta (iirc) in hindi or urdu, but searching for the latter only gave results for mortars and pestles, which are not the same thing as the one above, the ammikallu.