The Indus Dictionary Project
Standard Indus weights were cube shaped. This brings to mind the Mesopotamian theorectical standard cube called a 'gur' from which the Mesopotamian's measurement of mass was derived.
For image credits, please see below.
Indus Script Signs with Numbers: Sign List of the Indus Script: Iravatham Mahadevan, 1977: The Indus Script: Texts, Concordance and Tables: The Director General Archaeological Survey of India.
Indus Script Sign without a Number: Lynn Fawcett, 2017.