The Indus Dictionary Project
This is the symbol for a skein of yarn with the addition of a pair of hands. Hence, it is an ideograph for the noun fibre usage.
Harappa: Seal: H-144 a: Jagat Pati Joshi and Asko Parpola, 1987: Corpus of Indus Seals and Inscriptions: Volume 1: Page 201: Collections in India: Suomalainen Tiedeakatemia.
Inscription H-144 is interesting because it uses the merism weapons (bowstrings) and fine hangings to indicate that skeins of silk had a wide range of uses. H-144 was a seal. Therefore, it suggests that some silk was shipped as skeins of raw silk before being subject to further processing at its destination.
Indus Script Sign Number 4280: List of Sign Variants: Iravatham Mahadevan, 1977: The Indus Script: Texts, Concordance and Tables: The Director General Archaeological Survey of India.