Harappans used weights and measures for commercial as well as building purposes. Numerous articles used as weights have been discovered. The weights proceeded in a series, first doubling from 1, 2, 4, 8 to 64 and then in decimal multiples of 16. Several sticks inscribed with measure marks have been discovered. Harappans were inventors of linear system of measurement with a unit equal to one angula of the Arthasastra.