This is a pictograph of an adult person within the shafts of a handcart. Hence, it is the noun barrow boy.
Illustrative Text Reference:
Mohenjo-daro: Seal: M-130 a: Jagat Pati Joshi and Asko Parpola, 1987: Corpus of Indus Seals and Inscriptions: Volume 1: Page 43: Collections in India: Suomalainen Tiedeakatemia.
Comment:
There is only one extant example of this Indus sign.
Image Credit:
Indus Script Sign Number 2285: List of Sign Variants: Iravatham Mahadevan, 1977: The Indus Script: Texts, Concordance and Tables: The Director General Archaeological Survey of India.