This is a pictograph of a prop combined with two bunches of grapes. Hence, it is the noun grapevine.
Illustrative Text Reference:
Mohenjo-daro: Seal: M-101 a: Jagat Pati Joshi and Asko Parpola, 1987: Corpus of Indus Seals and Inscriptions: Volume 1: Page 38: Collections in India: Suomalainen Tiedeakatemia.
Image Credit:
Indus Script Sign Number 1537: List of Sign Variants: Iravatham Mahadevan, 1977: The Indus Script: Texts, Concordance and Tables: The Director General Archaeological Survey of India.