The Indus civilisation had a volumetric system with inscriptions on ceramic vessels indicating that the sign ‘V’ stood for a measure, a long linear stroke equalled 10, two long strokes stood for 20 and a short stroke represented one, according to Bryan Wells, who has been researching the Indus script for more than 20 years. These markings on the pots are identical to those found on the incised tablets and bas-relief tablets also found in Harappa.

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