The Indus Dictionary Project
This pictograph represents the outline of two bunches of grapes suspended beneath the canopy of a vine. Hence, it is the noun grapes.
Chanhujo-daro: Tablet in bas-relief: C-35 A: Jagat Pati Joshi and Asko Parpola, 1987: Corpus of Indus Seals and Inscriptions: Volume 1: Page 336: Collections in India: Suomalainen Tiedeakatemia.
C-35 was most probably a stamp, which means that the inscription in photograph C-35 A should be mirrored before it is read.
Indus Script Sign Number 321: Sign List of the Indus Script: Iravatham Mahadevan, 1977: The Indus Script: Texts, Concordance and Tables: The Director General Archaeological Survey of India.