This is a pictograph of the body of a cart with the verb to obscure placed inside it. Hence, the definition is a covered cart.
Illustrative Text Reference:
Harappa: Tablet in bas-relief: H-1988 A: Asko Parpola, B. M. Pande, and Petteri Koskikallio, 2010: Corpus of Indus Seals and Inscriptions: Volume 3,1: Page 272: New material, untraced objects, and collections outside India and Pakistan: Suomalainen Tiedeakatemia.
Image Credit:
Indus Script Sign Number 4446: List of Sign Variants: Iravatham Mahadevan, 1977: The Indus Script: Texts, Concordance and Tables: The Director General Archaeological Survey of India.