Low fired sealing in terra cotta of a unicorn seal from the Trench 54 area (H2000-4453/2174-192). This type of clay sealing was used to seal bundles of goods for transport.
Unicorn (so-called) motif in the ancient Indus Valley.
This silver seal with a unicorn motif is one of two found at Mohenjo-daro. Mackay 1938: Vol. 1, p. 348, Vol. 2, Pl. XC,1; XCVI, 520.
Sixteen three sided tablets (c. 2300 BCE) with incised inscription on each face were found all together in the debris that had been dumped over the curtain wall (54). On one of the three sides is an inscription that is identical to the last two signs
An additional six copies of these tablets, again all with the same inscriptions, were found elsewhere in the debris outside of perimeter wall  including two near the group of 16 and two in debris between the perimeter and curtain walls.
Unicorn seal (H2000-4500/10007-01) after conservation. Note the deeply chiseled engraving of the script similar to that found particularly on Period 3C rectangular seals.