This is a pictograph of a mule. The key identifiers for this animal are the large ears, the wide eye, the long face, and the full skirt of the tail.
Illustrative Text Reference:
Mohenjo-daro: Seal: M-78 a: Jagat Pati Joshi and Asko Parpola, 1987: Corpus of Indus Seals and Inscriptions: Volume 1: Page 33: Collections in India: Suomalainen Tiedeakatemia.
Comment:
There is only one extant example of this Indus sign.
Image Credit:
Mule: Lynn Fawcett, 2019.