The Indus Dictionary Project
My assumption is that this ideograph represents a stage in silk production known as throwing. The filaments coiled around the pack symbols are reeled silk. Two or more filaments of this raw silk will then be joined together to form what is known as singles. This is achieved by twisting them together in one direction using a spinning wheel. Hence, this is the noun silk singles.
Susa: Cylinder Seal: Jacques de Morgan excavations: Musée du Louvre: https://www.louvre.fr/en/oeuvre-notices/cylinder-seal-carved-elongated-buffalo-and-harappan-inscription: Accessed: 1 April 2018.
There is only one extant example of this Indus sign.
Indus Script Sign Number 9801: List of Sign Variants: Iravatham Mahadevan, 1977: The Indus Script: Texts, Concordance and Tables: The Director General Archaeological Survey of India.