This is a pictograph of a human lower limb. The limb is facing away from the reader. Hence, Mahadevan's sign number 1194 is an ideograph for the verb to depart.
Illustrative Text References:
Mohenjo-daro: Seal: M-168 a: Jagat Pati Joshi and Asko Parpola, 1987: Corpus of Indus Seals and Inscriptions: Volume 1: Page 50: Collections in India: Suomalainen Tiedeakatemia.
Mohenjo-daro: Seal: M-222 a: Jagat Pati Joshi and Asko Parpola, 1987: Corpus of Indus Seals and Inscriptions: Volume 1: Page 56: Collections in India: Suomalainen Tiedeakatemia.
Image Credit:
Indus Script Sign Number 1194: List of Sign Variants: Iravatham Mahadevan, 1977: The Indus Script: Texts, Concordance and Tables: The Director General Archaeological Survey of India.