The Indus Dictionary Project
This is a pictograph of two bundles strapped to a zip line. It is the verb to restrain or control. The symbol can be likened to the Chinese character shù 束.
Lothal: Seal impression: L-143 A: Jagat Pati Joshi and Asko Parpola, 1987: Corpus of Indus Seals and Inscriptions: Volume 1: Page 272: Collections in India: Suomalainen Tiedeakatemia.
Nadine Zubair, 2016: Dholavira and Its Mysterious Signboard: Image: The Ten Symbols of the Dholavira Signboard: Harappa.com: https://www.harappa.com/blog/dholavira-and-its-mysterious-sign-board: Accessed: 3 October 2018.
Asko Parpola lists 29 Indus signs that he classifies as variants of this Indus character¹. I do not know if any of the signs in Parpola's list has a different meaning to that above.
Indus Script Sign Number 1244: List of Sign Variants: Iravatham Mahadevan, 1977: The Indus Script: Texts, Concordance and Tables: The Director General Archaeological Survey of India.
1. Sign number 116: National Fund for Mohenjodaro: Corpus by Asko Parpola: A sign list of the Indus Script: Asko Parpola (Deciphering the Indus Script): http://www.mohenjodaroonline.net/index.php/indus-script/corpus-by-asko-parpola: Accessed: 21 July 2018.